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 A272441 Primes with a prime number of binary digits. 2
 2, 3, 5, 7, 17, 19, 23, 29, 31, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, 1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187, 1193 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..20000 EXAMPLE 7 is a term since its binary representation has 3 bits, a prime. 67 is a term since its binary representation has 7 bits, a prime. MATHEMATICA Select[Table[j, {j, 1, 1200}], (PrimeQ[#] && PrimeQ[Length@IntegerDigits[#, 2]]) &] Select[Prime[Range[200]], PrimeQ[Length[IntegerDigits[#, 2]]]&] (* Harvey P. Dale, Jun 04 2019 *) PROG (PARI) isok(n) = isprime(n) && isprime(#binary(n)); \\ Michel Marcus, Apr 30 2016 (PARI) forprime(d=2, 13, forprime(p=2^(d-1), 2^d, print1(p", "))) \\ Charles R Greathouse IV, May 01 2016 CROSSREFS Cf. A120533 (analogous in base 10). Sequence in context: A178209 A042994 A129692 * A155471 A158015 A042995 Adjacent sequences:  A272438 A272439 A272440 * A272442 A272443 A272444 KEYWORD nonn,base,easy AUTHOR Andres Cicuttin, Apr 30 2016 STATUS approved

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Last modified August 13 17:37 EDT 2022. Contains 356107 sequences. (Running on oeis4.)