The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105106 Numbers k such that the string k101 is prime. 4
 0, 5, 6, 8, 12, 15, 20, 21, 29, 42, 44, 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 k such that 1000*k + 101 is prime. - Stefan Steinerberger, Feb 21 2006 LINKS Daniel Starodubtsev, Table of n, a(n) for n = 1..10000 EXAMPLE If k=0, then k101 = 0101 (prime). If k=42, then k101 = 42101 (prime). MAPLE q:= n-> isprime(parse(cat(n, 101))): select(q, [\$0..300])[]; # Alois P. Heinz, Jan 23 2020 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 Missing a(11)=44 inserted by Daniel Starodubtsev, Jan 23 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 15 20:47 EDT 2024. Contains 371696 sequences. (Running on oeis4.)