[seqfan] a(n) = (sigma(a(n)) - phi(a(n)))/k for some k

[юрий герасимов]

Hello, SeqFans, a(n): 2 (k = 1), 12 (2), 42 (2), 1242 (2), 75920 (3), 1447488
(3), 3506976 (3), 61337440 (2)
This sequence is finite or infinite ? Thank you. Juri-Stepan Gerasimov.