a(n) = smallest palindrome k > n such that k/n is a square; a(n) = 0 if no solution exists.

Terms

a(0) =4a(1) =8a(2) =363a(3) =484a(4) =5445a(5) =46464a(6) =252a(7) =2138312a(8) =12321a(9) =0a(10) =44a(11) =23232a(12) =31213a(13) =686a(14) =53187678135a(15) =44944a(16) =272a(17) =24642a(18) =171a(19) =0a(20) =525a(21) =88a(22) =575a(23) =46464a(24) =5221225a(25) =62426a(26) =36963a(27) =252a(28) =464a(29) =0