The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vaclav Kotesovec, Table of n, a(n) for n = 1..8822 Vaclav Kotesovec, Plot of a(n)/n for n = 1..8000 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 Adjacent sequences: A078115 A078116 A078117 * A078119 A078120 A078121 KEYWORD nonn AUTHOR Benoit Cloitre, Dec 05 2002 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 1 15:30 EST 2023. Contains 367476 sequences. (Running on oeis4.)