A031130 - OEIS

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A031130

Number of proper factorizations of p1^n*p2^7, where p1 and p2 are distinct primes.

1

14, 44, 117, 256, 521, 974, 1751, 2997, 4986, 8042, 12692, 19583, 29718, 44323, 65209, 94641, 135804, 192698, 270821, 377047, 520623, 713122, 969783, 1309645, 1757446, 2343930, 3108552, 4100219

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OFFSET

0,1

LINKS

Ray Chandler, Table of n, a(n) for n = 0..200

FORMULA

a(n) = A002756(n) - 1 = A028422(2^n*3^7). - Ray Chandler, May 01 2017

CROSSREFS

Cf. A002756, A028422.

Sequence in context: A033587 A189807 A009942 * A215199 A375882 A216258

Adjacent sequences: A031127 A031128 A031129 * A031131 A031132 A031133

KEYWORD

nonn

AUTHOR

EXTENSIONS

Offset changed to 0 and more terms added by Ray Chandler, May 01 2017

STATUS

approved