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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 January 25 23:08 EST 2020. Contains 331270 sequences. (Running on oeis4.)