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A078118
n+1 does not divide sigma(n!).
1
1, 6, 22, 25, 28, 30, 40, 42, 46, 52, 58, 60, 68, 70, 72, 78, 87, 88, 96, 98, 102, 105, 106, 112, 114, 122, 126, 128, 130, 133, 138, 145, 148, 150, 156, 162, 166, 172, 178, 182, 190, 192, 196, 198, 212, 213, 217, 218, 222, 225, 226, 228, 232, 238, 240, 250, 262
OFFSET
1,2
LINKS
FORMULA
a(n) seems to be asymptotic to c*n with c=4.8....
MATHEMATICA
Select[Range[300], Not[Divisible[DivisorSigma[1, #!], # + 1]] &] (* Vaclav Kotesovec, Feb 16 2019 *)
CROSSREFS
Cf. A062569.
Sequence in context: A055043 A044067 A106685 * A095411 A242592 A044448
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Dec 05 2002
STATUS
approved