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

Author

Olivier Gérard, Mar 05 2020

Keywords

• nonn
• easy

Comments

A subset of A332987.

Crossrefs

Cf. A000326 (pentagonal numbers).

Programs

Mathematica

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