

A102624


Numbers k such that the number k23 is prime.


3



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
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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



