id:A165897 - OEIS Search Results

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a(n)=a(n-1)+(largest proper divisor of a(n-1), a(1)=4.

+0
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4, 6, 9, 12, 18, 27, 36, 54, 81, 108, 162, 243, 324, 486, 729, 972, 1458, 2187, 2916, 4374, 6561, 8748, 13122, 19683, 26244, 39366, 59049, 78732, 118098, 177147, 236196, 354294, 531441, 708588, 1062882, 1594323, 2125764, 3188646, 4782969 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(1)=4, a(2)=6, a(3)=9, n>3: a(n)=3*a(n-3).`
	MATHEMATICA	`NestList[ #+Divisors[ # ][[ -2]]&, 4, 50]`
	CROSSREFS	`Cf. A000792.` `Sequence in context: A144922 A088765 A078782 this_sequence A020165 A110607 A085802` `Adjacent sequences: A165894 A165895 A165896 this_sequence A165898 A165899 A165900`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Sep 29 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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