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

1,1

Comments

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

Links

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

Example

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

Mathematica

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

Crossrefs

Sequence in context: A049525 A286263 A236327 * A196134 A256321 A192136

Adjacent sequences: A109068 A109069 A109070 * A109072 A109073 A109074

Keyword

nonn,base

Author

Parthasarathy Nambi, Aug 17 2005

Extensions

More terms from Stefan Steinerberger, Mar 03 2006

Status

approved