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Primes whose reversal is a multiple of 8.
2

%I #13 Jul 28 2022 09:22:49

%S 23,61,211,251,257,293,401,409,443,449,487,631,673,677,821,823,827,

%T 829,863,2111,2113,2131,2137,2153,2179,2309,2341,2347,2381,2383,2389,

%U 2531,2539,2551,2557,2579,2591,2593,2707,2729,2741,2749,2767,2789,2917,2939,2953,2957

%N Primes whose reversal is a multiple of 8.

%C Subsequence of A355430 and of A355983.

%e 251 is a term since 251 is prime and 152 = 8 * 19.

%t Select[Prime[Range[500]], Divisible[IntegerReverse[#], 8] &] (* _Amiram Eldar_, Jul 25 2022 *)

%o (PARI) is(n) = fromdigits(Vecrev(digits(n)))%8 == 0 \\ _David A. Corneth_, Jul 25 2022

%Y Primes whose reversal is a multiple of k: A355430 (k=2), {3} (k=3), A355983 (k=4), A045711 (k=5), A087762 (k=7), this sequence (k=8), {11} (k=11), A087764 (k=13), A087765 (k=17), A087766 (k=19), A087767 (k=23)

%K nonn,base

%O 1,1

%A _Bernard Schott_, Jul 25 2022

%E More terms from _David A. Corneth_, Jul 25 2022