Numbers k such that k*(3k-1)/2 is a pentagonal palindrome.

Terms

a(0) =1a(1) =2a(2) =4a(3) =26a(4) =44a(5) =101a(6) =693a(7) =2173a(8) =2229a(9) =4228a(10) =6010a(11) =26466a(12) =26906a(13) =31926a(14) =44059a(15) =1258723a(16) =1965117a(17) =1979130a(18) =2684561a(19) =13280839a(20) =59401650a(21) =84885761a(22) =100058581a(23) =225563533a(24) =316882086a(25) =700457153a(26) =818049201a(27) =851649306a(28) =1345679688a(29) =2049123156