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A082478 Number of divisors d of n such that (d+1) is a divisor of (n+1) and (d+2) a divisor of (n+2). 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; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

a(2^n-1) = A001227(n).

PROG

(PARI) a(n)=sumdiv(n, d, if((n+1)%(d+1)+(n+2)%(d+2), 0, 1))

CROSSREFS

Sequence in context: A117546 A274196 A096811 * A279060 A324119 A083382

Adjacent sequences:  A082475 A082476 A082477 * A082479 A082480 A082481

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Apr 27 2003

STATUS

approved

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Last modified September 28 11:24 EDT 2020. Contains 337393 sequences. (Running on oeis4.)