OFFSET
1,1
REFERENCES
From a puzzle proposed by Marc LeBrun.
FORMULA
Sum_{n>=1} 1/a(n) = (4/5) * A065483 - 7/8 = 0.196827322859... . - Amiram Eldar, Sep 19 2023
MATHEMATICA
f[p_, e_] := NextPrime[p]^(e + 2); a[1] = 8; a[n_] := Times @@ f @@@ FactorInteger[n]; Array[a, 100] (* Amiram Eldar, Sep 19 2023 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
EXTENSIONS
More terms from David W. Wilson
STATUS
approved