A122261 - OEIS

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A122261

Characteristic function of numbers having only factors that are Pierpont primes.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) = if n=1 then 0 else A122262(n) - A122262(n-1);` `a(A122260(n)) = 1;` `a(n) = A122255(n) for n < 25.`
	LINKS	`Index entries for characteristic functions` `Eric Weisstein's World of Mathematics, Pierpont Prime`
	FORMULA	`Multiplicative with a(p) = A010051(p) * A065333(p-1), p prime.`
	CROSSREFS	`Sequence in context: A086299 A152066 A122255 * A014922 A014988 A015076` `Adjacent sequences: A122258 A122259 A122260 * A122262 A122263 A122264`
	KEYWORD	`nonn,mult`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 29 2006`

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.