A102816 Numbers k such that k111111111 is prime.

14, 17, 31, 35, 40, 53, 58, 73, 77, 94, 95, 101, 109, 116, 142, 149, 164, 196, 218, 226, 227, 233, 236, 253, 256, 257, 266, 268, 281, 295, 302, 311, 340, 341, 355, 359, 374, 385, 415, 418, 421, 428, 442, 443, 466, 469, 491, 542, 563, 571, 583, 599, 604, 614, 632, 656, 665, 667, 668

Offset

1,1

Links

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

Example

If k=14, then k111111111 = 14111111111 (prime).
If k=73, then k111111111 = 73111111111 (prime).
If k=142, then k111111111 = 142111111111 (prime).

Mathematica

Select[Range[700], PrimeQ[10^9 #+111111111]&] (* Harvey P. Dale, Feb 02 2026 *)

Prog

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

Crossrefs

Sequence in context: A054296 A155704 A105189 * A303305 A236685 A165719

Adjacent sequences: A102813 A102814 A102815 * A102817 A102818 A102819

Keyword

base,nonn

Author

Parthasarathy Nambi, Feb 26 2005

Status

approved