A166709 -id:A166709 - cp's OEIS frontend

A152430 Irregular triangle read by rows, giving actual sums arising in A166709.

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

Offset: 1

N. J. A. Sloane, Oct 24 2009, following a suggestion from Rick Shepherd, Oct 18 2009

			Triangle begins:
n=1: 2
n=2: 2,3,5
n=3: 2,3,5,8,10
n=4: 2,3,5,7,8,10,12,15,17
n=5: 2,3,5,7,8,10,11,12,15,17,18,23,26,28
n=6: 2,3,5,7,8,10,11,12,13,15,17,18,23,24,26,28,31,36,39,41

Rémy Sigrist, Table of n, a(n) for n = 1..10421
Rémy Sigrist, PARI program for A152430

Cf. A166709.

PARI
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See Links section.
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More terms from Rémy Sigrist, Jun 24 2021

A152415 a(n) = A166709(n) + 1.

Original entry on oeis.org

2, 4, 6, 10, 15, 21, 26, 33, 40, 50, 57, 69, 79, 93, 106, 116, 129, 145, 158, 172, 193, 212, 232, 254, 277, 298, 320, 340, 367, 397, 420, 443, 474, 501, 534, 562, 593, 629, 666, 692, 727, 760, 795, 833, 869, 901, 937, 980, 1029, 1071, 1115, 1160, 1209, 1249, 1299

Offset: 1

N. J. A. Sloane, Oct 24 2009

nonn

This takes the empty sum into account. Suggested by M. F. Hasler.

cp's OEIS Frontend

A152430 Irregular triangle read by rows, giving actual sums arising in A166709.

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A152415 a(n) = A166709(n) + 1.

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