Smallest multidigit palindromic centered n-gonal number.

Terms

a(0) =15151a(1) =181a(2) =141a(3) =919a(4) =22a(5) =121a(6) =55a(7) =11a(8) =111a(9) =121a(10) =131a(11) =141a(12) =151a(13) =161a(14) =171a(15) =55a(16) =191a(17) =121a(18) =22a(19) =189949981a(20) =484a(21) =505a(22) =151a(23) =11311a(24) =757a(25) =16661a(26) =88a(27) =181a(28) =72727a(29) =33