id:A082478 - OEIS Search Results

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Number of divisors d of n such that (d+1) is a divisor of (n+1) and (d+2) a divisor of (n+2).

+0
1

1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1 (list; graph; listen)

	OFFSET	`1,7`
	FORMULA	`a(2^n-1)= A001227(n)`
	PROGRAM	`(PARI) a(n)=sumdiv(n, d, if((n+1)%(d+1)+(n+2)%(d+2), 0, 1))`
	CROSSREFS	`Sequence in context: A037829 A117546 A096811 this_sequence A083382 A025900 A118383` `Adjacent sequences: A082475 A082476 A082477 this_sequence A082479 A082480 A082481`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 27 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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