Search: id:A107736
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%I A107736
%S A107736 35,46651605,62126595542551,82734857056306152425,
%T A107736 110179167429819564875005515
%N A107736 Pentagonal numbers that are half other pentagonal numbers.
%F A107736 a(n)=((A001653(4n-2)^2-1)/24
%e A107736 a(2)=((A001653(6)^2-1)/24=(33461^2-1)/24=46651605.
%Y A107736 Cf. A001653, A000326.
%Y A107736 Sequence in context: A139473 A110596 A126029 this_sequence A139474 A023929 
               A010113
%Y A107736 Adjacent sequences: A107733 A107734 A107735 this_sequence A107737 A107738 
               A107739
%K A107736 nonn
%O A107736 1,1
%A A107736 Franz Vrabec (franz.vrabec(AT)aon.at), Aug 26 2006

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