login
A104370
Sum of divisors of A104365(n) = A104350(n) + 1.
8
3, 4, 8, 14, 62, 182, 1372, 2522, 7562, 38272, 415802, 1247402, 16313472, 114107904, 570257104, 1161216000, 21043021824, 57893308852, 1099944846002, 5530978026000, 39437046917604, 425165932107504, 10235889009520064, 29233062045242352, 146100174169950002, 1917846796927501440, 5805987050510562240, 39918123659008838880
OFFSET
1,1
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..158 (terms 1..76 terms from Amiram Eldar, terms 142..151 from Tyler Busby)
FORMULA
a(n) = A000203(A104365(n)).
MATHEMATICA
a[n_] := DivisorSigma[1, 1 + Product[FactorInteger[k][[-1, 1]], {k, 1, n}]]; Array[a, 30] (* Amiram Eldar, Feb 12 2020 *)
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 06 2005
STATUS
approved