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Triangular array read by rows: T(n,k) = A337655(n) + A337655(k), for 1 <= k <= n.
8

%I #16 Oct 05 2020 01:28:41

%S 2,3,4,6,7,10,8,9,12,14,16,17,20,22,30,23,24,27,29,37,44,32,33,36,38,

%T 46,53,62,51,52,55,57,65,72,81,100,69,70,73,75,83,90,99,118,136,91,92,

%U 95,97,105,112,121,140,158,180,102,103,106,108,116,123,132,151,169,191,202

%N Triangular array read by rows: T(n,k) = A337655(n) + A337655(k), for 1 <= k <= n.

%C This is the lower triangular part of the addition table from A337655, read by rows.

%C Sequences A337659, A337660, A337661, A337662 arise from the addition and multiplication tables in A337655, each one described in two ways. Perhaps someone could help by creating the analogous sets of four sequences for the addition and multiplication tables in the closely related sequences A337656 and A337946.

%H Peter Kagey, <a href="/A337659/b337659.txt">Table of n, a(n) for n = 1..10011</a> (first 141 rows, flattened)

%e The addition table from A337655 begins:

%e 2, 3, 6, 8, 16, 23, 32, 51, 69, 91, ...

%e 3, 4, 7, 9, 17, 24, 33, 52, 70, 92, ...

%e 6, 7, 10, 12, 20, 27, 36, 55, 73, 95, ...

%e 8, 9, 12, 14, 22, 29, 38, 57, 75, 97, ...

%e 16, 17, 20, 22, 30, 37, 46, 65, 83, 105, ...

%e 23, 24, 27, 29, 37, 44, 53, 72, 90, 112, ...

%e 32, 33, 36, 38, 46, 53, 62, 81, 99, 121, ...

%e 51, 52, 55, 57, 65, 72, 81, 100, 118, 140, ...

%e 69, 70, 73, 75, 83, 90, 99, 118, 136, 158, ...

%e 91, 92, 95, 97, 105, 112, 121, 140, 158, 180, ...

%e ...

%Y Cf. A337655, A337660, A337661, A337662.

%K nonn,tabl

%O 1,1

%A _N. J. A. Sloane_, Oct 03 2020