A108980 - OEIS

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A108980

Numbers k such that the string k9111 is prime.

7, 10, 14, 16, 17, 28, 32, 35, 38, 53, 56, 58, 61, 67, 73, 77, 82, 91, 94, 103, 112, 121, 124, 127, 128, 133, 137, 143, 145, 164, 169, 176, 185, 190, 194, 196, 199, 214, 221, 229, 235, 248, 254, 257, 259, 263, 266, 269, 271, 275, 287, 292, 301, 310, 311, 313

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OFFSET

1,1

COMMENTS

Also numbers k such that 10000*k + 9111 is prime. - Stefan Steinerberger, Feb 26 2006

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

If k=7 then k9111 = 79111 (prime).

If k=94 then k9111 = 949111 (prime).

MATHEMATICA

Select[Range[350], PrimeQ[10000*# + 9111] &] (* Stefan Steinerberger, Feb 26 2006 *)