id:A073781 - OEIS Search Results

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Number of 2's in base-3 representation of n-th prime.

+0
3

1, 0, 1, 1, 1, 0, 2, 1, 2, 1, 0, 0, 1, 1, 2, 3, 2, 2, 1, 3, 2, 3, 1, 2, 1, 2, 1, 3, 0, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 3, 2, 2, 1, 3, 1, 2, 3, 3, 2, 4, 4, 4, 2, 1, 2, 3, 0, 1, 1, 0, 2, 1, 2, 2, 3, 1, 0, 2, 2, 1, 2, 1, 1, 1, 2, 2, 2, 3, 1, 2, 2, 4, 1, 2, 2, 3, 3 (list; graph; listen)

	OFFSET	`1,7`
	EXAMPLE	`a(7)=2 as 7th prime 17 is 122 in base-3 representation`
	MAPLE	`a2[n_] := Length[Cases[IntegerDigits[Prime[n], 3], 2]]`
	CROSSREFS	`Cf. A073779, A073780.` `Sequence in context: A121310 A024356 A143947 this_sequence A048622 A105661 A082451` `Adjacent sequences: A073778 A073779 A073780 this_sequence A073782 A073783 A073784`
	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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