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A029972

Palindromic primes in base 4.

2, 3, 5, 17, 29, 59, 257, 373, 409, 461, 509, 787, 839, 887, 907, 991, 4289, 4561, 5189, 5669, 5861, 6133, 6217, 6553, 6761, 7309, 7517, 7789, 7853, 12899, 13171, 13591, 14327, 14347, 14411, 14683, 14747, 14891, 15083, 15227, 15439, 15647

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

John Cerkan, Table of n, a(n) for n = 1..10000

P. De Geest, World!Of Palindromic Primes

MATHEMATICA

Do[s = RealDigits[n, 4][[1]]; If[PrimeQ[n], If[FromDigits[s] == FromDigits[Reverse[s]], Print[n]]], {n, 1, 1600}]

(* Alternative: *)

Select[Prime@ Range@ 1850, PalindromeQ@ IntegerDigits[#, 4] &] (* Michael De Vlieger, May 14 2017, Version 10 *)

PROG

(PARI) isok(n) = my(d=digits(n, 4)); d == Vecrev(d); \\ Michel Marcus, May 14 2017

CROSSREFS

Sequence in context: A216061 A348062 A349678 * A077498 A118958 A259596

Adjacent sequences: A029969 A029970 A029971 * A029973 A029974 A029975

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

URL: https://oeis.org/A029972

⇱ A029972 - OEIS