A064826 Numbers which are the sum of two pentagonal numbers (A000326) in exactly two different ways.

211, 215, 352, 381, 447, 602, 660, 663, 766, 807, 853, 874, 1002, 1172, 1197, 1248, 1259, 1372, 1427, 1457, 1571, 1612, 1622, 1639, 1652, 1665, 1752, 1850, 1862, 1927, 1996, 2047, 2152, 2245, 2297, 2302, 2332, 2351, 2415, 2472, 2497, 2506, 2523, 2618

Offset: 1

Author

Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 23 2001

Keywords

• nonn

Comments

211 = 176 + 35 = 210+1

Crossrefs

A064816, A000326.