sec(x), Taylor series for: A046976 */A046977 *, A000364 */A000142 *
sec(x): see also A000111
secant numbers: A000364 *
secant-tangent numbers: A000111 *
Second moment:: A006733 , A006741 , A006737
Secret Santa: A102262 /A102263
segmented numbers: A002048 *
self numbers, sequences related to (start):
self numbers:: A003052 *, A003219 , A006378
Self-contained numbers:: A005184
self-describing numbers, sequences related to (start):
self-describing numbers: A104784 , A108810 , A059504 , A109775 , A109776
self-dual, sequences related to (start):
self-dual:: A005137 , A003179 , A007147 , A003178 , A001532 , A002080 , A001206 , A006688 , A002841 , A004104 , A001531 , A003184 , A002077 , A004107
self-generating sequences, sequences related to (start):
self-generating sequences:: A005041 , A007538 , A003160 , A003045 , A003044 , A005243 , A001149 , A005244 , A005242 , A001856 , A003145 , A003144 , A003157 , A003156 , A003146
semi-Fibonacci numbers: A030067 *
semigroups , sequences related to (start):
semigroups : A001423 *, A023814 *, A027851 *, A079175
semigroups, asymmetric: A058104 *, A058105 , A058106 , A058107 *, A058113 -A058115 , A058168 -A058170
semigroups, by idempotents: A002786 , A002787 , A002788 , A005591 , A006966 , A058108 *, A058109 -A058122 , A058123 *, A058166 *, A058167 -A058170
semigroups, commutative: A001426 *, A006966 , A023815 *, A058105 , A058116 , A058117 , A058167 , A058168 , A079201
semigroups, idempotent: A002788 *, A006966 , A030449 , A030450 , A058112 *, A058115 , A058122
semigroups, inverse: A001428 *
semigroups, non-commutative: A079198 , A079199 , A079180
semigroups, numerical: A007323
semigroups, regular: A001427
semigroups, relation: A007903
semigroups, self-converse: A029851 *, A058106 , A058118 -A058122 , A058169
semigroups, with identity: see monoids
semigroups: see also monoids
semigroups: see also A030450 , A079207 , A079208 , A079209 , A079241 , A079242 , A079243 , A079244 , A079245
semiorders: A006531
semiperfect numbers: A005835 *
semiprimes (or semi-primes): sequences related to (start):
semiprimes (or semi-primes): A001358 *, A072000 ("pi"), A064911 , A066265
semiprimes: see also almost primes
separating families: A007600
sequence and first differences include all numbers: sequences related to (start):
sequence and first differences include all numbers: A005228 *, A030124 , A037257 , A037258 , A037259 , A061577 , A140778 , A129198 , A129199
sequences by number of increases: A000575
sequences depending on A-numbers in OEIS: see diagonal sequences
Sequences of prescribed quadratic character:: A001990 , A001992 , A001988 , A001986
sequences offering a monetary reward, sequences related to (start):
sequences offering a monetary reward: A030979 , A057641 , A079526 , A058209
sequences that contain every finite sequence of nonnegative integers, sequences related to (start):
sequences that contain every finite sequence of nonnegative integers: A067255 A108730 A108731 A098280 A098281 A098282 A108244 A108736 A108737 A055932 A066099
sequences that need extending, (start):
sequences that need extending, challenge problems: Looking for a good challenge? Try any of the following:
sequences that need extending, challenge problems: A000937 (closed n-snake-in-the-box problem)
sequences that need extending, challenge problems: A003142 (no-3-in-line on 3^n grid)
sequences that need extending, challenge problems: A004137 (maximal number of edges in a graceful graph on n nodes)
sequences that need extending, challenge problems: A006945 (smallest odd number that requires n Miller-Rabin primality tests)
sequences that need extending, challenge problems: A016088 and A046024 (when does Sum 1/p (p prime) exceed n?)
sequences that need extending, challenge problems: A076523 (maximal number of halving lines for 2n points in plane)
sequences that need extending, challenge problems: A081287 (packing squares of sizes 1 to n)
sequences that need extending, challenge problems: A085000 (maximal determinant of an n X n matrix using the integers 1 to n^2)
sequences that need extending, challenge problems: A087725 (n X n generalization of Sam Loyd's Fifteen Puzzle)
sequences that need extending, challenge problems: A087983 (values taken by permanent of n X n (0,1)-matrix)
sequences that need extending, challenge problems: A089472 (values taken by the determinant of a real (0,1)-matrix of order n)
sequences that need extending, challenge problems: A099155 (snake-in-the-box problem)
sequences that need extending, challenge problems: {a(1) = 1, a(2) = 4, a(3) <= 8, a(4) <= 24, a(5) <= 32}, from Erich Friedman, not yet in OEIS: minimum value of k so that k copies each of cubes of sides 1 through n can be used to exactly fill some rectangular box.
sequences that need extending, short sequences that badly need extending: (1) A001220 (Wieferich primes), A003142 (non-collinear points in cube), A007540 (Wilson primes), A048872 (line arrangements), A054909 (even unimodular lattice), A055549 (normal matrices), A058759 and A056287 (Shannon switching function), A074025 (triplewhist tournaments)
sequences that need extending, short sequences that badly need extending: (2) A076337 (Riesel numbers)
sequences that need extending: see also Challenge Problems: Independent Sets in Graphs
sequences that need extending: see also conjectured sequences
sequences that need extending: see also unsolved problems in number theory (selected)
sequences that need extending: see also huge web page with full list of sequences that need extending
sequences which agree for a long time but are different, sequences related to (start):
sequences which agree for a long time but are different: A004953 , A004973 , A025646 , A025661 , A025647 , A025653 , A084500 , A084557 , A103127 , A103192 , A103747 , A010918 , A019484
sequences which grow too rapidly to have their own entries, sequences related to (start):
sequences which grow too rapidly to have their own entries, see: Ackermann numbers (Comments on A046859 ), Conway-Guy sequence (Comments on A046859 ), Friedman sequence (Comments on A014221 ), Goodstein sequence (Comments on A056041 )
sequences whose extension requires factoring large numbers: A031439 , A031440 , A031442 , A082021 , A082132 , A034970 , A084599
sequences with a gap , sequences related to (start):
sequences with a gap (some later term is known) (1): A000043 , A001438 , A002853 , A005136 , A006066 , A016729 , A027623 , A037289 , A048893 ,
sequences with a gap (some later term is known) (2): A051070 , A063984 , A064156 , A068314 , A068489 , A070911 , A072127 , A072128 ,
sequences with a gap (some later term is known) (3): A072288 , A074025 , A077659 , A078457 , A078714 , A078814 , A080371 , A080372 ,
sequences with a gap (some later term is known) (4): A080802 , A088622 , A091295 , A091967 , A094670 , A098472 , A098876 , A100804 ,
sequences with a gap (some later term is known) (5): A103833 , A105674 , A105676 , A105677 , A109886 , A110409 , A112822 , A113571 ,
sequences with a gap (some later term is known) (6): A114457 , A118710 , A119479 , A119734 , A121154 .
sequences with a gap (some later term is known) (7): A002982 , A005849 , A055233 , A064593 , A066289 .
sequences with a gap (some later term is known) (8): (circulant graphs) A049287 , A049288 , A049289 , A049297 , A049309 , A060966 , A082276
sequences with a large but finite number of terms: see finite sequences with a large number of terms
Serbian: A056597
Serbian: see also Index entries for sequences related to number of letters in n
series-parallel , sequences related to "series-parallel" (start):
series-parallel networks, approximation to: A058585
series-parallel networks: A000084 * A000669 * A001572 A001573 A001574 A001575 A001677 A006349 A006350 A006351
series-parallel networks: see also Moon (1987), "Some enumerative results on series-parallel networks", sequences mentioned in
series-parallel numbers: A000137 A000163 A000432 A000527 A005840 A007803 A036654 A036655 A048172 A051045 A051389 A053554
set partitions: see also under partitions
sets of lists: A000262 , A002868
sets: see also under partitions
sexy prime pairs: A023201 , A046117
shadow of constants: A108912 , A110557 , A110621 , A110623
Shannon switching function: A058759 *
Shell sort: A003462 , A033622 , A036562 , A036564 , A036569 , A055875 , A055876
Shell sort: see also sorting
shift registers , sequences related to (start):
shift registers, enumeration of output sequences: A000013 , A000016 , A000031
shift registers, enumeration of: A001139
shift registers, periods: A005417
shift registers, see also necklaces
shifts left when transformed, sequences related to (start):
shifts left when transformed:: (1) A007461 , A007439 , A007560 , A007464 , A003238 , A007562 , A007477 , A007558 , A007462 , A007463 , A007548 , A007469
shifts left when transformed:: (2) A003659 , A007460 , A007551 , A007557 , A007561 , A007563 , A007472 , A007549 , A007470 , A007564 , A007556
shoe lacing: see lacing a shoe
shoelaces: see lacing a shoe
shogi (Japanese chess): A062103
short sequences that need extending, see sequences that need extending
shuffle , shuffling etc., sequences related to (start):
shuffle groups: see groups, shuffle
shuffling (1): A000375 A000376 A002139 A007070 A007071 A007346 A014525 A014766 A014767 A019567
shuffling (2): A024222 A024542 A035485 A035490 A035491 A035492 A035493 A035494 A035499 A035500 A035501 A047992
shuffling (3): A002326 * A055388