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A299799 Carmichael numbers (A002997) that are Chebyshev pseudoprimes (A175530). 2


%S 443372888629441,582920080863121,39671149333495681,842526563598720001,

%T 2380296518909971201,3188618003602886401,33711266676317630401,

%U 54764632857801026161,122762671289519184001,361266866679292635601

%N Carmichael numbers (A002997) that are Chebyshev pseudoprimes (A175530).

%C Odd composite integer n is in this sequence if n == 1 or p (mod (p^2-1)/2) for every prime p|n.

%C No other terms below 10^21.

%Y Intersection of A002997 and A175530.

%Y Contains A175531 as a subsequence.

%K nonn,hard,more

%O 1,1

%A _Max Alekseyev_, Feb 19 2018

%E a(9) from _Daniel Suteu_ confirmed and a(10) added by _Max Alekseyev_, Dec 16 2020

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Last modified January 29 10:55 EST 2023. Contains 359922 sequences. (Running on oeis4.)