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A140705 A000012 * A051731^4. 2

%I #5 Aug 27 2023 08:44:04

%S 1,5,1,9,1,1,19,5,1,1,23,5,1,1,1,39,9,5,1,1,1,43,9,5,1,1,1,1,63,19,5,

%T 5,1,1,1,1,73,19,9,5,1,1,1,1,1,89,23,9,5,5,1,1,1,1,1,93,23,9,5,5,1,1,

%U 1,1,1,1

%N A000012 * A051731^4.

%C Row sums = A061203: (1, 6, 11, 26, 31, 56,...).

%C Left column = A061202: (1, 5, 9, 19, 23, 39,...).

%F A000012 * A051731^4 as infinite lower triangular matrices, where A051731 = the inverse Mobius transform and A000012 = an infinite lower triangular matrix with all 1's.

%e First few rows of the triangle are:

%e 1;

%e 5, 1;

%e 9, 1, 1;

%e 19, 5, 1, 1;

%e 23, 5, 1, 1, 1;

%e 39, 9, 5, 1, 1, 1;

%e 43, 9, 5, 1, 1, 1, 1;

%e 63, 19, 5, 5, 1, 1, 1, 1;

%e ...

%Y Cf. A051731, A061203, A061202.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, May 24 2008

%E a(60) split into 5,1 by _Georg Fischer_, Aug 27 2023

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)