OFFSET
1,3
COMMENTS
LINKS
Jaroslav Krizek, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = n(n+1)/2 mod A000203(n).
EXAMPLE
For n=10, a(10) = antisigma(10) mod sigma(10) = 37 mod 18 = 1.
MATHEMATICA
Table[Mod[n (n + 1)/2, DivisorSigma[1, n]], {n, 100}] (* T. D. Noe, Nov 27 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Nov 25 2013
STATUS
approved