A358207 Numbers k such that k^2 + 2 is a palindrome.
0, 1, 2, 3, 8, 13, 19, 85, 258, 393, 828, 1811, 2538, 2916, 2986, 3627, 4540, 10503, 140833, 268865, 298436, 423437, 902696, 1050503, 1845571, 2491032, 5513951, 14365940, 25809892, 26237622, 28559254, 61875091, 79094282, 186062629, 246553448, 451977320, 452357920, 620208559, 813448358, 849937635
Offset: 1
Programs
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PARI
isok(k) = my(d=digits(k^2+2)); d == Vecrev(d); \\ Michel Marcus, Nov 04 2022