OFFSET
1,2
COMMENTS
a(n) = n iff n is 1 or a prime power; otherwise, a(n) > n. - Ivan Neretin, May 31 2016
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
EXAMPLE
a(75) = a(3^1 * 5^2) = (3+5)^(1+2) = 8^3 = 512.
MATHEMATICA
pf2pe[n_]:=Module[{tfi=Transpose[FactorInteger[n]]}, Total[ First[tfi]]^ Total[ Last[tfi]]]; Array[pf2pe, 60] (* Harvey P. Dale, Sep 21 2011 *)
Array[Power @@ Map[Total, Transpose@ FactorInteger@ #] &, 58] (* Michael De Vlieger, Apr 25 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 26 2003
STATUS
approved