Search: id:A153793
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%I A153793
%S A153793 0,13,65,156,286,455,663,910,1196,1521,1885,2288,2730,3211,3731,4290,
%T A153793 4888,5525,6201,6916,7670,8463,9295,10166,11076,12025,13013,14040,15106,
%U A153793 16211,17355,18538,19760,21021,22321,23660,25038,26455
%N A153793 13 times pentagonal numbers: 13n(3n-1)/2.
%F A153793 a(n) = (39n^2 - 13n)/2 = A000326(n)*13.
%F A153793 a(n)=39*n+a(n-1)-65 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 15 2009]
%e A153793 For n=2, a(2)=39*2+0-65=13; n=3, a(3)=39*3+13-65=65; n=4, a(4)=39*4+65-65=156 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 15 2009]
%Y A153793 Cf. A000326, A153792.
%Y A153793 Sequence in context: A054477 A010820 A022705 this_sequence A067160 A147067 
               A147075
%Y A153793 Adjacent sequences: A153790 A153791 A153792 this_sequence A153794 A153795 
               A153796
%K A153793 easy,nonn,new
%O A153793 0,2
%A A153793 Omar E. Pol (info(AT)polprimos.com), Jan 01 2009

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