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A238233
Numbers n such that n = sigma(phi(n)) - phi(n).
1
132496, 1052576, 5656464, 12936992, 19230208, 187545888, 1740340368, 163150299648
OFFSET
1,1
COMMENTS
A107654(n) = phi(A238233(n)).
Other terms are 748001267712 and 21301524386075232 (see comment in A107654).
MAPLE
with(numtheory); list_A238233:=proc(q) local n;
for n from 1 to q do if n=sigma(phi(n))-phi(n) then print(n);
fi; od; end: list_A238233(10^9);
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Paolo P. Lava, Feb 25 2014
STATUS
approved