OFFSET
1,2
COMMENTS
Integers in this sequence which are themselves primes include a(2) = 3, a(11) = 61, a(12) = 73, a(20) = 191, a(23) = 257, a(26) = 311, a(62) = 1697, a(67) = 1949, a(68) = 2017. Integers in this sequence which are perfect powers greater than 1 of composites include a(14) = 100, a(53) = 1225.
MATHEMATICA
Accumulate[Array[Times@@Flatten[FactorInteger[#]]&, 60]] (* Harvey P. Dale, Sep 16 2018 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Aug 26 2005
STATUS
approved