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Safe primes that are also highly cototient numbers.
0

%I #15 Dec 22 2024 12:21:35

%S 23,47,59,83,167,839,2099,5879,6719,23099,27299,180179,414959,420419,

%T 628319,660659,840839,1141139,1681679,2042039,2277659,4084079,5525519,

%U 5705699

%N Safe primes that are also highly cototient numbers.

%H PrimeFan, <a href="http://primefan.tripod.com/EsotericIntegerSequences.html">Listing of Esoteric Integer Sequences</a>

%H PrimeFan, <a href="/A031214/a031214.pdf">Esoteric Integer Sequences</a> [Cached copy]

%Y A005385 intersect A100827.

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_, Mar 05 2012

%E a(19)-a(24) calculated from the b-file at A100827 by _Amiram Eldar_, Apr 09 2020