A087764 Primes whose reversal is a multiple of 13.

19, 31, 269, 281, 397, 401, 457, 463, 523, 773, 827, 1063, 1117, 1123, 1367, 1373, 1427, 1433, 1489, 1549, 1609, 1621, 1871, 1931, 1987, 1993, 2027, 2089, 2161, 2221, 2399, 2459, 2531, 2593, 2647, 2707, 2713

Offset: 1

Author

Zak Seidov, Oct 03 2003

Keywords

• easy
• nonn
• base

Comments

There are no primes (besides 11) whose reversal is a multiple of 11.

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Primes whose reversal is a multiple of k: A087762 (k=7), this sequence (k=13), A087765 (k=17), A087766 (k=19), A087767 (k=23).

Programs

Maple

digrev:= proc(n) local L, i;
  L:= convert(n,base,10);
  add(L[-i]*10^(i-1), i=1..nops(L))
end proc:
B:= map(digrev, {seq(i,i=13..10000,13)}):
sort(convert(select(isprime, B),list)); # Robert Israel, Oct 23 2019

PARI

forprime(n=2, 3000, if(fromdigits(Vecrev(digits(n)))%13==0, print1(n, ", "))) \\ Mohammed Yaseen, Jul 19 2022