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 A089968 Decimal primes whose decimal representation in base 16 is also prime. 1
 2, 3, 5, 7, 17, 19, 23, 41, 67, 71, 83, 89, 97, 103, 113, 131, 137, 151, 257, 263, 311, 313, 337, 359, 401, 409, 547, 563, 569, 577, 593, 599, 617, 631, 641, 643, 659, 787, 823, 839, 857, 883, 919 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE 43 is prime in decimal and 43 base 16 is 67 which is also prime in decimal. MATHEMATICA b16Q[n_]:= Module[{idn16=IntegerDigits[n, 16]}, Max[idn16]<10&&PrimeQ[FromDigits[idn16]]]; Select[Prime[Range[PrimePi[2000]]], b16Q] (* Vincenzo Librandi, Apr 18 2013 *) CROSSREFS Sequence in context: A090725 A276141 A214588 * A164060 A113029 A090432 Adjacent sequences:  A089965 A089966 A089967 * A089969 A089970 A089971 KEYWORD base,nonn AUTHOR Cino Hilliard, Jan 18 2004 STATUS approved

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Last modified May 17 12:55 EDT 2021. Contains 343971 sequences. (Running on oeis4.)