A122257 - OEIS

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A122257

Characteristic function of Pierpont primes.

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; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`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	`Table of n, a(n) for n=1..105.` `Index entries for characteristic functions` `Eric Weisstein's World of Mathematics, Pierpont Prime`
	FORMULA	`a(n) = A010051(n) * A065333(n-1).`
	CROSSREFS	`Sequence in context: A143222 A010060 A118247 * A129950 A010051 A131929` `Adjacent sequences: A122254 A122255 A122256 * A122258 A122259 A122260`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller, Aug 29 2006`
	STATUS	`approved`

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Last modified May 23 01:22 EDT 2013. Contains 225585 sequences.