[seqfan] n = number of divisors of 2^n -1

[Leroy Quet]

I get the sequence where a positive integer n is included if
n = the number of divisors of 2^n - 1,
begins:
1,2,4,6,8,16

(Every term from a(5) = 8 on is a multiple of 4, due to Catalan's conjecture.)

Is this sequence finite? Is it in the OEIS?

Thanks,
Leroy Quet

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