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Numbers k such that k! is a "compact factorial", i.e., k! is in A169661.
1

%I #8 Nov 17 2015 11:43:00

%S 1,2,3,6,7,10,11

%N Numbers k such that k! is a "compact factorial", i.e., k! is in A169661.

%C Sequence linked to A050376.

%H T. M. Apostol, <a href="https://zbmath.org/?q=an:1112.11006">Review of "Compact integers and factorials" by V. Shevelev</a>, zbMATH.

%H V. Shevelev, <a href="http://dx.doi.org/10.4064/aa126-3-1">Compact integers and factorials</a>, Acta Arith. 126 (2007), no.3, 195-236.

%F a(n)! = A169661(n).

%Y Cf. A050376, A054861, A169661.

%K nonn,fini,full

%O 1,2

%A _Jonathan Sondow_, Nov 17 2015