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 A082709 Numbers k such that (35*10^(k-1) - 53)/9 is a plateau prime. 1
 3, 13, 31, 61, 117, 291, 633, 1065, 1495, 5433, 7363 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Prime versus probable prime status and proofs are given in the author's table. REFERENCES C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9. LINKS Table of n, a(n) for n=1..11. Patrick De Geest, PDP Reference Table - 383. Makoto Kamada, Prime numbers of the form 388...883. Index entries for primes involving repunits. FORMULA a(n) = A056256(n) + 2. EXAMPLE k=13 -> (35*10^(13-1) - 53)/9 = 3888888888883. CROSSREFS Cf. A082697-A082720, A056256. Sequence in context: A051939 A257764 A146728 * A154833 A106090 A067980 Adjacent sequences: A082706 A082707 A082708 * A082710 A082711 A082712 KEYWORD nonn,base,hard,more AUTHOR Patrick De Geest, Apr 13 2003 EXTENSIONS Edited by Ray Chandler, Nov 05 2014 STATUS approved

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Last modified December 6 15:29 EST 2023. Contains 367610 sequences. (Running on oeis4.)