OFFSET
1,1
COMMENTS
Chowla's function (A048050) = sum of divisors of n except 1 and n.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MAPLE
with(numtheory):
[seq(`if`((sigma(i)-i-1) mod (tau(i)-1) <> 0, i, print( )), i=2..500)];
MATHEMATICA
Select[Range[2, 150], !Divisible[DivisorSigma[1, #]-#-1, DivisorSigma[ 0, #]- 1]&] (* Harvey P. Dale, May 27 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 19 2000
STATUS
approved