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A087764 Primes whose reversal is a multiple of 13. 10
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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

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

PROG

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

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).

Sequence in context: A240126 A125602 A139847 * A146691 A146784 A147240

Adjacent sequences: A087761 A087762 A087763 * A087765 A087766 A087767

KEYWORD

easy,nonn,base

AUTHOR

Zak Seidov, Oct 03 2003

STATUS

approved

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Last modified November 30 08:36 EST 2022. Contains 358438 sequences. (Running on oeis4.)