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 A102248 Numbers n such that n111 is prime. 5
 2, 4, 8, 10, 16, 22, 25, 26, 28, 35, 40, 44, 47, 50, 58, 65, 68, 70, 79, 80, 86, 92, 94, 95, 101, 109, 112, 113, 128, 131, 136, 140, 142, 143, 149, 152, 154, 169, 170, 179, 182, 184, 187, 196, 205, 208, 217, 218, 227, 235, 236, 260, 262, 263, 266, 278, 283, 284 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE At n=2, n111 = 2111 (prime). At n=50, n111 = 50111 (prime). At n=95, n111 = 95111 (prime). MATHEMATICA Select[ Range[ 290], PrimeQ[ FromDigits[ Flatten[ IntegerDigits /@ { #, 1, 1, 1}]]] &] (* Robert G. Wilson v, Feb 21 2005 *) Select[Range[300], PrimeQ[1000#+111]&] (* Harvey P. Dale, Jul 07 2019 *) PROG (PARI) is(n)=isprime(1000*n+111) \\ Charles R Greathouse IV, May 22 2017 CROSSREFS Cf. A024912. Sequence in context: A093547 A068382 A025612 * A161374 A272062 A045795 Adjacent sequences:  A102245 A102246 A102247 * A102249 A102250 A102251 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Feb 18 2005 EXTENSIONS More terms from Robert G. Wilson v, Feb 21 2005 STATUS approved

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Last modified January 26 16:58 EST 2020. Contains 331280 sequences. (Running on oeis4.)