OFFSET
1,1
COMMENTS
See A066272 for definition of anti-divisor.
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
MATHEMATICA
atQ[n_] := Divisible[DivisorSigma[0, n], Count[Flatten[Quotient[#, Rest[Select[Divisors[#], OddQ]]] & /@ (2 n + Range[-1, 1])], Except[1]]]; Select[Range[3, 805], atQ] (* Jayanta Basu, Jul 01 2013 *)
PROG
(PARI) ad(n)=numdiv(2*n+1)+numdiv(2*n-1)+numdiv(n>>valuation(n, 2))-5
is(n)=n>2 && numdiv(n)%ad(n)==0 \\ Charles R Greathouse IV, Jul 01 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Aug 31 2002
STATUS
approved