A102527 Numbers k such that k111111 is prime.

29, 34, 61, 71, 80, 85, 89, 94, 101, 103, 106, 107, 115, 118, 122, 124, 128, 131, 149, 158, 163, 166, 193, 194, 199, 205, 212, 233, 248, 251, 256, 265, 268, 277, 290, 316, 323, 326, 328, 346, 347, 355, 356, 361, 365, 367, 382, 383, 386, 389, 394, 398, 404, 424, 430, 431, 436, 439, 452, 454, 457

Offset

1,1

Links

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Example

If k=29, then k111111 = 29111111 (prime).
If k=101, then k111111 = 101111111 (prime).
If k=122, then k111111 = 122111111 (prime).

Mathematica

Select[Range[500], PrimeQ[FromDigits[Join[IntegerDigits[#], {1, 1, 1, 1, 1, 1} ]]]&] (* Harvey P. Dale, Aug 22 2011 *)
Select[Range[500], PrimeQ[#*10^6+111111]&] (* Harvey P. Dale, Nov 30 2022 *)

Prog

(Magma) [ n: n in [1..700] | IsPrime(Seqint([1, 1, 1, 1, 1, 1] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 04 2011

Crossrefs

Sequence in context: A031172 A159022 A280643 * A039307 A043130 A043910

Adjacent sequences: A102524 A102525 A102526 * A102528 A102529 A102530

Keyword

base,nonn

Author

Parthasarathy Nambi, Feb 24 2005

Status

approved