id:A086299 - OEIS Search Results

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a(n) = if n is 7-smooth then 1 else 0: characteristic function of 7-smooth numbers.

+0
1

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

	OFFSET	`1,1`
	LINKS	`Index entries for characteristic functions` `Eric Weisstein's World of Mathematics, Smooth Number`
	FORMULA	`Multiplicative with: a(p) = if p<=7 then 1 else 0, p prime.`
	CROSSREFS	`Cf. A002473.` `Sequence in context: A137794 A105586 A136522 this_sequence A122255 A122261 A014922` `Adjacent sequences: A086296 A086297 A086298 this_sequence A086300 A086301 A086302`
	KEYWORD	`nonn,mult`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 15 2003`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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