Search: id:A131875
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%I A131875
%S A131875 1,5,4,12,5,7,22,6,8,10,35,7,9,11,13,51,8,10,12,14,16,70,9,11,13,15,17,
%T A131875 19,92,10,12,14,16,18,20,22,117,11,13,15,17,19,21,23,25,145,12,14,16,18,
%U A131875 20,22,24,26,28
%N A131875 A000012 * A131844.
%C A131875 Left column = pentagonal numbers, A000326: (1, 5, 12, 22,...). Row sums 
               = A001106: (1, 9, 24, 46, 75, 111,...).
%F A131875 A000012 * A131844 as infinite lower triangular matrices.
%e A131875 First few rows of the triangle are:
%e A131875 1;
%e A131875 5, 4;
%e A131875 12, 5, 7;
%e A131875 22, 6, 8, 10;
%e A131875 35, 7, 9, 11, 13;
%e A131875 51, 8, 10, 12, 14, 16;
%e A131875 70, 9, 11, 13, 15, 17, 19;
%e A131875 92, 10, 12, 14, 16, 18, 20, 22;
%e A131875 ...
%Y A131875 Cf. A131844, A001106, A000326.
%Y A131875 Sequence in context: A165367 A140869 A166549 this_sequence A095871 A019068 
               A147685
%Y A131875 Adjacent sequences: A131872 A131873 A131874 this_sequence A131876 A131877 
               A131878
%K A131875 nonn,tabl
%O A131875 0,2
%A A131875 Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 22 2007

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