OFFSET
1,2
COMMENTS
It seems that a(n) is asymptotic to c*n with c = 4.8...
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
A114338(a(n)) mod a(n) = 0.
EXAMPLE
8 is in the sequence because the number of divisor of 8!! is A114338(8) = 16, which is divisible by 8.
MATHEMATICA
ok[n_] := Divisible[ DivisorSigma[0, n!!], n]; Select[ Range[200], ok]
PROG
(PARI) isok(n) = (numdiv(prod(i=0, (n-1)\2, n - 2*i)) % n) == 0; \\ after first Pari in A006882; Michel Marcus, Oct 02 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Oct 01 2016
STATUS
approved