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A031130 Number of proper factorizations of p1^n*p2^7, where p1 and p2 are distinct primes. 1

%I #5 May 01 2017 13:45:17

%S 14,44,117,256,521,974,1751,2997,4986,8042,12692,19583,29718,44323,

%T 65209,94641,135804,192698,270821,377047,520623,713122,969783,1309645,

%U 1757446,2343930,3108552,4100219

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

%H Ray Chandler, <a href="/A031130/b031130.txt">Table of n, a(n) for n = 0..200</a>

%F a(n) = A002756(n) - 1 = A028422(2^n*3^7). - _Ray Chandler_, May 01 2017

%Y Cf. A002756, A028422.

%K nonn

%O 0,1

%A _Jeff Burch_

%E Offset changed to 0 and more terms added by _Ray Chandler_, May 01 2017

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Last modified May 21 19:35 EDT 2024. Contains 372738 sequences. (Running on oeis4.)