a(n) = smallest palindrome > a(n-1) such that a(1)*a(2)*...*a(n) + 1 and a(1)*a(2)*...*a(n) - 1 are primes.

A051955

a(n) = smallest palindrome > a(n-1) such that a(1)*a(2)*...*a(n) + 1 and a(1)*a(2)*...*a(n) - 1 are primes.

Terms

    a(0) =4a(1) =363a(2) =434a(3) =484a(4) =494a(5) =636a(6) =4004a(7) =46864a(8) =47474a(9) =135531a(10) =695596a(11) =1793971a(12) =1826281a(13) =1933391a(14) =4700074a(15) =4785874a(16) =4806084a(17) =6462646a(18) =6574756a(19) =9558559a(20) =15399351a(21) =46288264a(22) =53500535a(23) =57499475a(24) =150787051a(25) =185808581a(26) =197636791a(27) =226686622

External references