id:A122257 - OEIS Search Results

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Characteristic function of Pierpont primes.

+0
4

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

	OFFSET	`1,1`
	COMMENT	`a(n) = if (n is prime) and (n-1 is 3-smooth) then 1 else 0.` `a(n) = if n=1 then 0 else A122258(n) - A122258(n-1);` `a(A122259(n)) = 0, a(A005109(n)) = 1.`
	LINKS	`Eric Weisstein's World of Mathematics, Pierpont Prime`
	FORMULA	`a(n) = A010051(n) * A065333(n-1).`
	CROSSREFS	`Adjacent sequences: A122254 A122255 A122256 this_sequence A122258 A122259 A122260` `Sequence in context: A053866 A010060 A118247 this_sequence A129950 A010051 A131929`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Aug 29 2006`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

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