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 A187113 Primes of the form abcdabcd..abcda. 1
 10061, 10091, 10111, 10141, 10151, 10181, 10211, 10271, 10301, 10321, 10331, 10391, 10501, 10531, 10601, 10631, 10651, 10691, 10711, 10771, 10781, 10831, 10861, 10891, 11071, 11131, 11161, 11171, 11251, 11261, 11311, 11321, 11351, 11411, 11471, 11491, 11551 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence appears to be infinite. The number of terms below 10^1000 are 5749. LINKS Shyam Sunder Gupta, Table of n, a(n) for n = 1..3032 EXAMPLE a(2)= 10091 is in the sequence because it is a prime of the form abcda. MATHEMATICA s[n_]:=Select[Union@Flatten@Table[FromDigits@Flatten@Join[IntegerDigits@Table[b, {n}], {IntegerDigits@Floor[b/1000]}], {b, 1000, 9999}], PrimeQ]; Array[s, 2]//Flatten CROSSREFS Cf. A228625, A228627 Sequence in context: A250711 A223431 A203089 * A023356 A292176 A198484 Adjacent sequences: A187110 A187111 A187112 * A187114 A187115 A187116 KEYWORD nonn,base AUTHOR Shyam Sunder Gupta, Aug 30 2013 STATUS approved

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Last modified March 26 05:52 EDT 2023. Contains 361529 sequences. (Running on oeis4.)