Numbers which can written in exactly four ways as a sum of two distinct nonzero pentagonal numbers.

Terms

a(0) =13352a(1) =18877a(2) =45397a(3) =49052a(4) =52027a(5) =53727a(6) =62652a(7) =64182a(8) =73152a(9) =74977a(10) =76677a(11) =79327a(12) =80671a(13) =85177a(14) =87972a(15) =88577a(16) =90702a(17) =91652a(18) =93302a(19) =96669a(20) =98827a(21) =101752a(22) =106036a(23) =106822a(24) =109227a(25) =109487a(26) =116117a(27) =118477a(28) =125347a(29) =133267