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 A109071 Numbers k such that the string k123123 is prime. 3
 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)