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A160404
Numbers k such that 23*10^(k + 2) + 57 is prime.
0
0, 1, 3, 8, 21, 32, 33, 48, 68, 295, 296, 298, 1081, 1753, 1963, 4336, 5008, 5608, 14240
OFFSET
1,3
COMMENTS
a(20) > 40000. - Michael S. Branicky, Jul 24 2024
MATHEMATICA
lst = {}; Do[ If[ PrimeQ[23*10^(n + 2) + 57], AppendTo[ lst, n]], {n, 0, 6000}]; lst (* Robert G. Wilson v, May 29 2009 *)
CROSSREFS
Cf. A160403 (primes of the form 23*10^(k + 2) + 57).
Sequence in context: A334136 A046815 A203848 * A103736 A172243 A101332
KEYWORD
nonn,base,more
AUTHOR
Lekraj Beedassy, May 13 2009
EXTENSIONS
a(8)-a(18) from Robert G. Wilson v, May 29 2009
Name edited by Jinyuan Wang, Aug 10 2021
a(19) from Michael S. Branicky, Mar 10 2023
STATUS
approved