A103540 Numbers k such that the string k2357111317 is prime.

4, 15, 16, 28, 30, 42, 48, 49, 57, 79, 87, 105, 106, 123, 133, 139, 144, 153, 157, 172, 178, 192, 207, 210, 217, 225, 228, 235, 270, 274, 283, 315, 339, 349, 357, 364, 381, 399, 402, 433, 442, 465, 468, 472, 475, 487, 493, 505, 507, 514, 526, 529, 543, 574, 624, 636, 637, 655, 675

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

If k=4, then k2357111317 = 42357111317 (prime).
If k=42, then k2357111317 = 422357111317 (prime).
If k=87, then k2357111317 = 872357111317 (prime).

Mathematica

Select[Range[700], PrimeQ[#*10^10+2357111317]&] (* Harvey P. Dale, Jun 09 2018 *)

Prog

(Magma) [ n: n in [1..700] | IsPrime(Seqint([7, 1, 3, 1, 1, 1, 7, 5, 3, 2] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 03 2011

Crossrefs

Sequence in context: A228589 A066862 A228590 * A065159 A240265 A051956

Adjacent sequences: A103537 A103538 A103539 * A103541 A103542 A103543

Keyword

base,nonn

Author

Parthasarathy Nambi, Mar 23 2005

Status

approved