The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A103541 Numbers n such that n23571113171923 is prime. 1
 1, 3, 7, 10, 12, 25, 60, 81, 87, 136, 159, 169, 171, 205, 213, 220, 235, 238, 240, 241, 259, 324, 339, 340, 411, 448, 459, 511, 513, 537, 543, 558, 642, 652, 670, 688, 690, 705, 721, 754, 768, 775, 777, 795, 801, 808, 834, 862, 885, 892, 936, 943, 961, 964 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE At n=1, n23571113171923 = 123571113171923 (prime). At n=25, n23571113171923 = 2523571113171923 (prime). At n=136, n23571113171923 = 13623571113171923 (prime). MAPLE select(t -> isprime(t*10^14+23571113171923), [\$0..1000]); # Robert Israel, Sep 28 2018 MATHEMATICA fQ[n_] := PrimeQ[ FromDigits[ Join[ IntegerDigits[n], {2, 3, 5, 7, 1, 1, 1, 3, 1, 7, 1, 9, 2, 3}]]]; Select[ Range[ 983], fQ[ # ] &] (* Robert G. Wilson v, Mar 26 2005 *) Select[Range[1000], PrimeQ[10^14 # + 23571113171923] &] (* Vincenzo Librandi, Sep 28 2018 *) CROSSREFS Sequence in context: A310181 A310182 A020679 * A183178 A340604 A310183 Adjacent sequences:  A103538 A103539 A103540 * A103542 A103543 A103544 KEYWORD base,nonn AUTHOR Parthasarathy Nambi, Mar 22 2005 EXTENSIONS More terms from Robert G. Wilson v, Mar 26 2005 STATUS approved

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

Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)