OFFSET
1,1
COMMENTS
A variation of Ruth-Aaron numbers with unitary prime-power divisors instead of prime divisors.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
s[1] = 0; s[n_] := Plus @@ (Power @@@ FactorInteger[n]); seq = {}; s1 = 0; Do[s2 = s[n]; If[s1 == s2, AppendTo[seq, n - 1]]; s1 = s2, {n, 2, 10^5}]; seq
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Jan 05 2020
STATUS
approved