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

1,1

Comments

211 = 176 + 35 = 210+1

Links

Table of n, a(n) for n=1..44.

Crossrefs

A064816, A000326.

Sequence in context: A020365 A031780 A036232 * A333012 A136601 A108406

Adjacent sequences: A064823 A064824 A064825 * A064827 A064828 A064829

Keyword

nonn

Author

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

Status

approved