A238233 Numbers n such that n = sigma(phi(n)) - phi(n).

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).

Links

Table of n, a(n) for n=1..8.

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

Cf. A000010, A000203, A107654.

Sequence in context: A345395 A161356 A236735 * A242327 A339535 A319063

Adjacent sequences: A238230 A238231 A238232 * A238234 A238235 A238236

Keyword

nonn,more

Author

Paolo P. Lava, Feb 25 2014

Status

approved