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

1,1

Links

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

Rémy Sigrist, PARI program for A152430

Example

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

Prog

(PARI) See Links section.

Crossrefs

Cf. A166709.

Sequence in context: A256015 A138117 A175908 * A297495 A117918 A302495

Adjacent sequences: A152427 A152428 A152429 * A152431 A152432 A152433

Keyword

nonn,tabf

Author

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

Extensions

More terms from Rémy Sigrist, Jun 24 2021

Status

approved