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Carmichael numbers (A002997) that are not absolute Euler pseudoprimes (A033181).
4

%I #25 Jun 25 2019 11:32:12

%S 561,1105,2821,6601,8911,10585,29341,52633,62745,63973,101101,115921,

%T 126217,188461,252601,278545,294409,314821,334153,340561,410041,

%U 512461,552721,658801,748657,825265,852841,1024651,1033669,1082809,1152271,1193221,1461241,1569457,1909001

%N Carmichael numbers (A002997) that are not absolute Euler pseudoprimes (A033181).

%C These are composite numbers n such that b^(n-1) == 1 (mod n) and abs(b^((n-1)/2) mod n) <> 1 for every b coprime to n.

%H Amiram Eldar, <a href="/A262043/b262043.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..131 from Daniel Lignon)

%Y Cf. A002997 (Carmichael numbers), A033181 (absolute Euler pseudoprimes).

%K nonn

%O 1,1

%A _Daniel Lignon_, Sep 09 2015