A109292 Numbers k such that the string k235723572357 is prime.

5, 8, 44, 82, 83, 118, 157, 160, 163, 176, 179, 197, 199, 206, 229, 239, 242, 250, 251, 269, 293, 298, 304, 307, 331, 335, 337, 346, 358, 373, 388, 412, 422, 461, 478, 479, 485, 499, 500, 505, 527, 554, 557, 565, 566, 569, 590, 619, 632, 643, 646, 649, 656

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Example

If k=5 then k235723572357 = 5235723572357 (prime).
If k=83 then k235723572357 = 83235723572357 (prime).

Mathematica

f[n_] := ToExpression[ToString[n] <> "235723572357"]; Do[If[PrimeQ[f[n]], Print[n]], {n, 1, 1000}] (* Ryan Propper, Sep 14 2005 *)
Select[Range[700], PrimeQ[# 10^12+235723572357]&] (* Harvey P. Dale, Aug 21 2021 *)

Crossrefs

Sequence in context: A130223 A126750 A256401 * A275571 A192379 A117474

Adjacent sequences: A109289 A109290 A109291 * A109293 A109294 A109295

Keyword

nonn,base

Author

Parthasarathy Nambi, Aug 20 2005

Extensions

More terms from Ryan Propper, Sep 14 2005

Status

approved