A287961 Numbers that are the sum of two palindromic primes (A002385).

4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 16, 18, 22, 103, 104, 106, 108, 112, 133, 134, 136, 138, 142, 153, 154, 156, 158, 162, 183, 184, 186, 188, 192, 193, 194, 196, 198, 202, 232, 252, 262, 282, 292, 302, 312, 315, 316, 318, 320, 322, 324, 332, 342, 355, 356, 358, 360, 362, 364, 372, 375, 376, 378, 380

Offset: 1

Author

Ilya Gutkovskiy, Jun 03 2017

Keywords

• nonn
• base

Links

• Eric Weisstein's World of Mathematics, Palindromic Prime
• Index entries for sequences related to palindromes

Crossrefs

Cf. A002113, A002385, A014091, A035137, A260254, A260255, A261906.

Programs

Mathematica

nmax = 380; f[x_] := Sum[Boole[PalindromeQ[k] && PrimeQ[k]] x^k, {k, 1, nmax}]^2; Exponent[#, x] & /@ List @@ Normal[Series[f[x], {x, 0, nmax}]]