OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MAPLE
with(numtheory): [seq(`if`(i mod (tau(i)-1) <> 0, i, print( )), i=2..190)];
MATHEMATICA
Select[Range[2, 120], ! Divisible[#, DivisorSigma[0, #] - 1] &] (* Amiram Eldar, Aug 28 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 17 2000
STATUS
approved