login
A103119
Numbers n such that n0999 is prime.
0
7, 10, 23, 26, 29, 34, 41, 43, 47, 62, 73, 80, 89, 92, 97, 98, 100, 121, 124, 131, 142, 149, 155, 157, 173, 175, 181, 182, 191, 197, 202, 203, 218, 229, 230, 236, 241, 245, 250, 253, 262, 268, 272, 274, 275, 286, 289, 293, 295, 302, 311, 320, 323, 331, 335, 338
OFFSET
1,1
EXAMPLE
If n=7, then n0999 = 70999 (prime).
If n=41, then n0999 = 410999 (prime).
If n=80, then n0999 = 800999 (prime).
MATHEMATICA
fQ[n_] := PrimeQ[ FromDigits[ Join[ IntegerDigits[n], {0, 9, 9, 9}]]]; Select[ Range[ 349], fQ[ # ] &] (* Robert G. Wilson v, Mar 26 2005 *)
CROSSREFS
Cf. A104153.
Sequence in context: A097634 A120312 A074377 * A054224 A183330 A196316
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Mar 16 2005
EXTENSIONS
Edited and extended by Robert G. Wilson v, Mar 26 2005
STATUS
approved