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A342469 Positive numbers that are triangular, square or pentagonal. 0
1, 3, 4, 5, 6, 9, 10, 12, 15, 16, 21, 22, 25, 28, 35, 36, 45, 49, 51, 55, 64, 66, 70, 78, 81, 91, 92, 100, 105, 117, 120, 121, 136, 144, 145, 153, 169, 171, 176, 190, 196, 210, 225, 231, 247, 253, 256, 276, 287, 289, 300, 324, 325, 330, 351, 361, 376, 378, 400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..59.

PROG

(PARI) isok(m) = ispolygonal(m, 3) || ispolygonal(m, 4) || ispolygonal(m, 5);

CROSSREFS

Cf. A000290, A000217, A000326, A005214.

Cf. A245646, A245647, A245648.

Sequence in context: A081944 A129948 A050414 * A266322 A136681 A206330

Adjacent sequences:  A342466 A342467 A342468 * A342470 A342471 A342472

KEYWORD

nonn

AUTHOR

Michel Marcus, Mar 13 2021

STATUS

approved

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Last modified August 1 00:13 EDT 2021. Contains 346377 sequences. (Running on oeis4.)