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

443372888629441, 582920080863121, 39671149333495681, 842526563598720001, 2380296518909971201, 3188618003602886401, 33711266676317630401, 54764632857801026161, 122762671289519184001, 361266866679292635601, 4208895375600667752001, 7673096805497432749441

Offset: 1

Author

Max Alekseyev, Feb 19 2018

Keywords

• nonn
• hard
• more

Comments

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

No other terms below 10^22.

Crossrefs

Intersection of A002997 and A175530.

Contains A175531 as a subsequence.

Extensions

a(9) from Daniel Suteu confirmed and a(10) added by Max Alekseyev, Dec 16 2020

a(11)-a(12) from Max Alekseyev, Apr 21 2024