A332988 Sums of two distinct nonzero pentagonal numbers.

6, 13, 17, 23, 27, 34, 36, 40, 47, 52, 56, 57, 63, 71, 73, 75, 82, 86, 92, 93, 97, 104, 105, 114, 118, 121, 122, 127, 129, 139, 143, 146, 150, 152, 157, 162, 167, 168, 177, 180, 181, 187, 188, 196, 198, 209, 211, 215, 222, 227, 232, 237, 245, 246, 248, 252, 259, 261, 262, 268, 269, 280, 282, 288, 292, 293, 298, 299, 302, 309, 317, 321, 322, 327, 331, 335, 338, 339, 342, 352, 355, 357, 364, 365, 377, 379, 381, 386, 388, 392, 398

Offset

1,1

Comments

A subset of A332987.

Links

Table of n, a(n) for n=1..91.

Mathematica

Total/@Subsets[PolygonalNumber[5, Range[20]], {2}]//Union (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 22 2020 *)

Crossrefs

Cf. A000326 (pentagonal numbers).

Sequence in context: A090068 A070899 A265756 * A333011 A197562 A322431

Adjacent sequences: A332985 A332986 A332987 * A332989 A332990 A332991

Keyword

nonn,easy

Author

Olivier Gérard, Mar 05 2020

Status

approved