OFFSET
1,2
LINKS
Ilya Gutkovskiy, Logarithmic scatter plot of a(n) up to n=30000
Eric Weisstein's World of Mathematics, Prime Factorization
FORMULA
EXAMPLE
a(60) = 15 because 60 = 2^2*3*5, min{2^2,3,5} = 3, max{2^2,3,5} = 5 and 3*5 = 15.
MATHEMATICA
a[n_] := Min[#[[1]]^#[[2]] & /@FactorInteger[n]] Max[#[[1]]^#[[2]] & /@FactorInteger[n]]; Table[a[n], {n, 65}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, May 08 2018
STATUS
approved