id:A073780 - OEIS Search Results

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Number of 1's in base 3 representation of n-th prime.

+0
3

0, 1, 1, 1, 1, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 3, 3, 3, 3, 1, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 3, 1, 3, 3, 1, 1, 3, 1, 1, 1, 1, 3, 1, 1, 3, 3, 3, 5, 3, 3, 3, 3, 1, 3, 5, 3, 3, 3, 3, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3 (list; graph; listen)

	OFFSET	`1,6`
	FORMULA	`a1[n_] := Length[Cases[IntegerDigits[Prime[n], 3], 1]]`
	EXAMPLE	`a1(11)=3 as 11th prime, 31, is 1011 in base 3 representation`
	MATHEMATICA	`a1[n_] := Length[Cases[IntegerDigits[Prime[n], 3], 1]]`
	CROSSREFS	`Cf. A073779, A073781.` `Sequence in context: A049639 A046555 A029382 this_sequence A124389 A027023 A052371` `Adjacent sequences: A073777 A073778 A073779 this_sequence A073781 A073782 A073783`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com) Aug 11 2002`

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

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