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 A105106 Numbers n such that the string n101 is prime. 3
 0, 5, 6, 8, 12, 15, 20, 21, 29, 42, 50, 53, 54, 56, 60, 65, 72, 74, 77, 78, 81, 83, 89, 95, 98, 102, 107, 116, 117, 119, 125, 131, 135, 138, 141, 149, 170, 174, 177, 182, 194, 197, 201, 204, 210, 221, 224, 230, 240, 242, 243, 252, 258, 261, 263, 264, 282, 285, 291 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Also numbers such that 1000*n+101 is prime. - Stefan Steinerberger, Feb 21 2006 LINKS EXAMPLE If n=0, then n101 = 0101 (prime). If n=42, then n101 = 42101 (prime). MATHEMATICA For[n = 0, n < 300, n++, If[PrimeQ[1000*n + 101], Print[n]]] (* Stefan Steinerberger, Feb 21 2006 *) PROG (PARI) is(n)=isprime(1000*n+101) \\ Charles R Greathouse IV, May 22 2017 CROSSREFS Sequence in context: A033158 A193569 A032721 * A140504 A120131 A047437 Adjacent sequences:  A105103 A105104 A105105 * A105107 A105108 A105109 KEYWORD base,nonn AUTHOR Parthasarathy Nambi, Apr 07 2005 EXTENSIONS More terms from Stefan Steinerberger, Feb 21 2006 STATUS approved

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Last modified October 14 00:32 EDT 2019. Contains 327991 sequences. (Running on oeis4.)