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 A023148 Numbers k such that prime(k) == 6 (mod k). 12
 1, 5, 79, 445, 16055, 27067045, 1208198549, 1208198609, 1208198615, 2636913002983, 885992692751479, 885992692751483, 885992692751833, 43525513764815035, 43525513764815057, 43525513764815173, 43525513764816367 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(18) > 2.8*10^20. - Giovanni Resta, Feb 23 2020 LINKS MATHEMATICA NextPrim[n_] := Block[{k = n + 1}, While[ !PrimeQ[k], k++ ]; k]; p = 1; Do[ If[ Mod[p = NextPrim[p], n] == 6, Print[n]], {n, 1, 10^9}] (* Robert G. Wilson v, Feb 18 2004 *) PROG (Sage) def A023148(max) :     terms = []     p = 2     for n in range(1, max+1) :         if (p - 6) % n == 0 : terms.append(n)         p = next_prime(p)     return terms # Eric M. Schmidt, Feb 05 2013 CROSSREFS Cf. A092048, A023143, A023144, A023145, A023146, A023147, A023149, A023150, A023151, A023152. Sequence in context: A057186 A106939 A142114 * A200986 A197893 A198010 Adjacent sequences:  A023145 A023146 A023147 * A023149 A023150 A023151 KEYWORD nonn,more AUTHOR EXTENSIONS Extended by Robert G. Wilson v, Feb 18 2004 a(7)-a(9) from Robert G. Wilson v, Feb 22 2006 First two terms inserted by Eric M. Schmidt, Feb 05 2013 a(10)-a(17) from Giovanni Resta, Feb 23 2020 STATUS approved

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Last modified June 12 08:13 EDT 2021. Contains 344943 sequences. (Running on oeis4.)