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Or a(n) is the number of proper H-divisors > 1 of A207017(n).
Table of n, a(n) for n=1..60.
Cf. A207017, A207666.
Sequence in context: A105522 A131774 A078316 * A293838 A055443 A003842
Adjacent sequences: A207665 A207666 A207667 * A207669 A207670 A207671
Vladimir Shevelev, Feb 19 2012