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A050990 2-Knodel numbers. 9
4, 6, 8, 10, 12, 14, 22, 24, 26, 30, 34, 38, 46, 56, 58, 62, 74, 82, 86, 94, 106, 118, 122, 132, 134, 142, 146, 158, 166, 178, 182, 194, 202, 206, 214, 218, 226, 254, 262, 274, 278, 298, 302, 314, 326, 334, 346, 358, 362, 382, 386, 394, 398, 422, 446, 454, 458 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

Eric Weisstein's World of Mathematics, Knoedel 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, 2) # Paolo P. Lava, Feb 24 2012

CROSSREFS

Cf. A002997, A033553, A050992, A050993, A208154-A208158.

Sequence in context: A061344 A066664 A064938 * A225514 A161546 A231571

Adjacent sequences:  A050987 A050988 A050989 * A050991 A050992 A050993

KEYWORD

nonn

AUTHOR

Eric W. Weisstein

STATUS

approved

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Last modified April 25 00:50 EDT 2014. Contains 240991 sequences.