OFFSET
1,2
EXAMPLE
1.23971953814622741196504267652458710467...
MATHEMATICA
RealDigits[N[Sum[1/DivisorSigma[n, n], {n, 1, 100}], 130]][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Michel Lagneau, Nov 28 2011
STATUS
approved