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A029972
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Palindromic primes in base 4.
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11
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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
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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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 *)
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PROG
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(PARI) isok(n) = my(d=digits(n, 4)); d == Vecrev(d); \\ Michel Marcus, May 14 2017
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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