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 A208155 7-Knödel numbers. 7
 15, 49, 91, 133, 217, 259, 301, 427, 469, 511, 553, 679, 721, 763, 889, 973, 1015, 1057, 1099, 1141, 1267, 1351, 1393, 1477, 1561, 1603, 1687, 1897, 1939, 1981, 2107, 2149, 2191, 2317, 2359, 2443, 2569, 2611, 2653, 2779, 2863, 2947, 3031, 3073, 3199, 3241, 3409 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 Eric Weisstein, Knödel Numbers. MAPLE with(numtheory); knodel:= proc(i, k) local a, n, ok; for n from k+1 to i do   ok:=1;   for a from 1 to n do      if gcd(a, n)=1 then  if (a^(n-k) mod n)<>1 then ok:=0; break; fi; fi;   od;   if ok=1 then print(n); fi; od; end: knodel(10000, 7); MATHEMATICA (* First run program for A208154 to define knodelQ *) Select[Range[3500], knodelQ[#, 7] &] (* Alonso del Arte, Feb 24 2012 *) CROSSREFS Cf. A002997, A050990, A033553, A050992, A050993, A208154, A208156-A208158. Sequence in context: A065906 A154060 A168305 * A228219 A272039 A241577 Adjacent sequences:  A208152 A208153 A208154 * A208156 A208157 A208158 KEYWORD nonn AUTHOR Paolo P. Lava, Feb 24 2012 STATUS approved

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Last modified December 7 00:16 EST 2019. Contains 329812 sequences. (Running on oeis4.)