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 A029972 Palindromic primes in base 4. 9
 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}] (* Second program: *) 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: A127062 A214735 A216061 * A077498 A118958 A259596 Adjacent sequences:  A029969 A029970 A029971 * A029973 A029974 A029975 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified October 17 07:05 EDT 2018. Contains 316276 sequences. (Running on oeis4.)