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

Author

Parthasarathy Nambi, Feb 24 2005

Keywords

• base
• nonn

Examples

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

Links

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

Programs

Magma

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

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 *)