OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..1831
FORMULA
a(n) = sigma(A054004(n)).
EXAMPLE
See example in A054004.
MATHEMATICA
Select[Partition[Table[{n, DivisorSigma[0, n], DivisorSigma[1, n]}, {n, 116*10^5}], 2, 1], #[[1, 2]]== #[[2, 2]] && #[[1, 3]]==#[[2, 3]]&][[All, 1, 3]] (* Harvey P. Dale, May 16 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 12 2000
EXTENSIONS
More terms from Jud McCranie, Oct 15 2000
Definition clarified by Harvey P. Dale, May 16 2023
STATUS
approved