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A291637 Carmichael numbers (A002997) that are super-Poulet numbers (A050217). 1
294409, 1299963601, 4215885697, 4562359201, 7629221377, 13079177569, 19742849041, 45983665729, 65700513721, 147523256371, 168003672409, 227959335001, 459814831561, 582561482161, 1042789205881, 1297472175451, 1544001719761, 2718557844481, 3253891093249, 4116931056001, 4226818060921, 4406163138721, 4764162536641, 4790779641001, 5419967134849, 7298963852041, 8470346587201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Problem: are there infinitely many such numbers?

From Daniel Suteu, Sep 17 2020: (Start)

If we consider f(n) to be the smallest number in the sequence with n prime factors, then we have:

f(3) = 294409,

f(4) = 3018694485093841,

f(5) <= 521635331852681575100906881,

f(6) <= 2835402730651853232634509813787097410561,

f(7) <= 165784025660216242122027716057592895796242004385542265601. (End)

LINKS

Max Alekseyev, Table of n, a(n) for n = 1..983 (all terms below 2^64)

CROSSREFS

Intersection of A178997 and A002997.

Sequence in context: A182206 A178997 A328938 * A206237 A236153 A023351

Adjacent sequences:  A291634 A291635 A291636 * A291638 A291639 A291640

KEYWORD

nonn,changed

AUTHOR

Max Alekseyev and Thomas Ordowski, Aug 28 2017

STATUS

approved

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Last modified September 20 17:03 EDT 2020. Contains 337265 sequences. (Running on oeis4.)