OFFSET
1,2
COMMENTS
a(12) > 50000.
a(14) > 200000. - Michel Marcus, Feb 25 2016
EXAMPLE
(1 - tau(1))^1 + (2 - tau(2))^2 + ... + (5 - tau(5))^5 = 245 and 245 / 5 = 49.
MAPLE
with(numtheory); P:=proc(q) local n, t; t:=0;
for n from 1 to q do t:=t+(n-tau(n))^n; if t mod n=0 then print(n);
fi; od; end: P(10^6);
PROG
(PARI) isok(n) = sum(i=1, n, Mod(i-numdiv(i), n)^i) == 0; \\ Michel Marcus, Feb 25 2016
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Paolo P. Lava, Sep 16 2013
EXTENSIONS
Name corrected by Michel Marcus, Feb 25 2016
a(12)-a(13) from Michel Marcus, Feb 25 2016
STATUS
approved