A109071 Numbers k such that the string k123123 is prime.

2, 8, 19, 31, 37, 64, 68, 71, 79, 85, 89, 94, 100, 109, 128, 136, 137, 148, 149, 157, 170, 178, 179, 181, 184, 190, 194, 211, 215, 233, 241, 250, 251, 269, 277, 284, 290, 293, 298, 304, 310, 313, 314, 316, 317, 326, 331, 353, 355, 367, 370, 376, 386, 394, 400

Offset: 1

Author

Parthasarathy Nambi, Aug 17 2005

Keywords

• nonn
• base

Comments

Also numbers k such that 10^6*k+123123 is prime. - Stefan Steinerberger, Mar 03 2006

Examples

			If k=2 then k123123 = 2123123 (prime).
If k=94 then k123123 = 94123123 (prime).
		

Links

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

Programs

Mathematica

Select[Range[0, 500], PrimeQ[10^6*# + 123123] &] (* Stefan Steinerberger, Mar 03 2006 *)

Extensions

More terms from Stefan Steinerberger, Mar 03 2006