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

Author

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

Keywords

• nonn
• tabf

Examples

			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
		

Links

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

Crossrefs

Cf. A166709.

Programs

PARI

See Links section.

Extensions

More terms from Rémy Sigrist, Jun 24 2021