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Irregular triangle read by rows, giving actual sums arising in A166709.
2

%I #5 Jun 24 2021 13:23:47

%S 2,2,3,5,2,3,5,8,10,2,3,5,7,8,10,12,15,17,2,3,5,7,8,10,11,12,15,17,18,

%T 23,26,28,2,3,5,7,8,10,11,12,13,15,17,18,23,24,26,28,31,36,39,41,2,3,

%U 5,7,8,10,11,12,13,15,17,18,23,24,26,28,30,31,36,39,41,48,53,56,58

%N Irregular triangle read by rows, giving actual sums arising in A166709.

%H Rémy Sigrist, <a href="/A152430/b152430.txt">Table of n, a(n) for n = 1..10421</a>

%H Rémy Sigrist, <a href="/A152430/a152430.gp.txt">PARI program for A152430</a>

%e Triangle begins:

%e n=1: 2

%e n=2: 2,3,5

%e n=3: 2,3,5,8,10

%e n=4: 2,3,5,7,8,10,12,15,17

%e n=5: 2,3,5,7,8,10,11,12,15,17,18,23,26,28

%e n=6: 2,3,5,7,8,10,11,12,13,15,17,18,23,24,26,28,31,36,39,41

%o (PARI) See Links section.

%Y Cf. A166709.

%K nonn,tabf

%O 1,1

%A _N. J. A. Sloane_, Oct 24 2009, following a suggestion from Rick Shepherd, Oct 18 2009

%E More terms from _Rémy Sigrist_, Jun 24 2021