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A152430 Irregular triangle read by rows, giving actual sums arising in A166709. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

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

CROSSREFS

Sequence in context: A256015 A138117 A175908 * A297495 A117918 A302495

Adjacent sequences:  A152427 A152428 A152429 * A152431 A152432 A152433

KEYWORD

nonn,tabf,more

AUTHOR

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

STATUS

approved

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Last modified May 18 19:58 EDT 2021. Contains 344002 sequences. (Running on oeis4.)