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 A050992 4-Knödel numbers. 12
 6, 8, 12, 16, 20, 24, 28, 40, 44, 48, 52, 60, 68, 76, 80, 92, 112, 116, 120, 124, 148, 154, 164, 172, 188, 208, 212, 236, 240, 244, 264, 268, 280, 284, 292, 316, 332, 340, 356, 364, 388, 404, 412, 428, 436, 452, 508, 520, 524, 548, 556, 596, 604, 628, 652 (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's World of Mathematics, 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(1000, 4) # Paolo P. Lava, Feb 24 2012 MATHEMATICA Select[Range[6, 1000, 2], Divisible[# - 4, CarmichaelLambda[#]]&] (* Jean-François Alcover, Mar 01 2018 *) CROSSREFS Cf. A002997, A050990, A033553, A050993, A208154-A208158. Sequence in context: A177085 A194409 A115166 * A090259 A089241 A280270 Adjacent sequences:  A050989 A050990 A050991 * A050993 A050994 A050995 KEYWORD nonn AUTHOR STATUS approved

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Last modified October 23 22:52 EDT 2019. Contains 328378 sequences. (Running on oeis4.)