A102624 Numbers k such that the number k23 is prime.

0, 2, 5, 8, 11, 12, 14, 15, 17, 18, 24, 30, 33, 36, 38, 39, 44, 45, 47, 50, 53, 56, 59, 63, 68, 75, 77, 78, 81, 84, 86, 89, 93, 96, 99, 102, 107, 114, 119, 123, 128, 129, 135, 137, 143, 144, 147, 149, 158, 159, 162, 168, 171, 176, 179, 182, 185, 194, 200, 201, 203, 210

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

If k=2, then k23 = 223 (prime).
If k=45, then k23 = 4523 (prime).
If k=99, then k23 = 9923 (prime).

Mathematica

Select[Range[0, 300], PrimeQ[100#+23]&] (* Harvey P. Dale, Apr 08 2019 *)

Prog

(Magma) [ n: n in [1..700] | IsPrime(Seqint([3, 2] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 04 2011; misses the zero
(PARI) is(n)=isprime(100*n+23) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. A103401, A103408, A103118.

Sequence in context: A031141 A143263 A327138 * A070328 A124934 A125217

Adjacent sequences: A102621 A102622 A102623 * A102625 A102626 A102627

Keyword

nonn,base

Author

Parthasarathy Nambi, Jan 31 2005

Extensions

More terms from Robert G. Wilson v, Feb 04 2005

Status

approved