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 A109069 Numbers n such that the string n2323 is prime. 1
 1, 3, 4, 6, 12, 19, 22, 25, 43, 48, 52, 54, 57, 63, 66, 67, 70, 73, 82, 84, 85, 87, 111, 132, 139, 145, 150, 151, 157, 159, 160, 172, 175, 187, 195, 201, 204, 210, 211, 213, 216, 217, 223, 228, 235, 238, 241, 256, 258 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE n=1 is in the sequence because n2323 = 12323 is prime. n=87 is in the sequence because n2323 = 872323 is prime. MAPLE select(t -> isprime(10^4*t+2323), [\$1..1000]); # Robert Israel, Mar 05 2020 CROSSREFS Sequence in context: A024373 A111159 A210523 * A329953 A329671 A124571 Adjacent sequences: A109066 A109067 A109068 * A109070 A109071 A109072 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Aug 17 2005 STATUS approved

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Last modified May 27 02:08 EDT 2024. Contains 372847 sequences. (Running on oeis4.)