A355983 Primes whose reversal is a multiple of 4.

23, 29, 61, 67, 211, 233, 239, 251, 257, 271, 277, 293, 401, 409, 421, 443, 449, 461, 463, 467, 487, 613, 617, 619, 631, 653, 659, 673, 677, 691, 809, 821, 823, 827, 829, 863, 881, 883, 887, 2111, 2113, 2129, 2131, 2137, 2141, 2143, 2153, 2161, 2179, 2309, 2311, 2333, 2339, 2341, 2347, 2351

Offset

1,1

Comments

Equivalently, primes starting with 21, 23, 25, 27, 29, 40, 42, 44, 46, 48, 61, 63, 65, 67, 69, 80, 82, 84, 86, 88.

Subsequence of A355430.

Links

Table of n, a(n) for n=1..56.

Example

67 is a term since 67 is prime and 76 is divisible by 4.

Mathematica

Select[Prime[Range[350]], Divisible[IntegerReverse[#], 4] &] (* Amiram Eldar, Jul 22 2022 *)

Prog

(PARI) isok(p) = isprime(p) && !(fromdigits(Vecrev(digits(p))) % 4); \\ Michel Marcus, Jul 22 2022

Crossrefs

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

Sequence in context: A046124 A157677 A092518 * A110584 A115396 A180538

Adjacent sequences: A355980 A355981 A355982 * A355984 A355985 A355986

Keyword

nonn,base

Author

Bernard Schott, Jul 22 2022

Status

approved