A102372 Numbers k such that k11111 is prime.

3, 5, 6, 9, 20, 24, 26, 39, 42, 48, 60, 65, 68, 83, 84, 93, 95, 108, 119, 126, 132, 146, 167, 179, 182, 189, 203, 206, 213, 224, 227, 230, 233, 234, 249, 258, 269, 270, 272, 291, 296, 305, 315, 324, 329, 336, 341, 345, 347, 348, 363, 368, 377, 384, 387, 392, 402, 422, 423, 438, 440, 450, 455, 458

Offset: 1

Author

Parthasarathy Nambi, Feb 22 2005

Keywords

• base
• nonn

Examples

			If k=3, then k11111 = 311111 (prime).
If k=60, then k11111 = 6011111 (prime).
If k=126, then k11111 = 12611111 (prime).
		

Crossrefs

Cf. A101471, A102248, A102249.

Programs

Magma

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

Mathematica

Select[Range[500],PrimeQ[100000#+11111]&] (* Harvey P. Dale, Jan 15 2013 *)