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
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Jan 31 2005
EXTENSIONS
More terms from Robert G. Wilson v, Feb 04 2005
STATUS
approved