Add to n its second smallest non-divider. Loop

franktaw at franktaw at
Wed Jun 25 23:57:49 CEST 2008

This rule simply takes n to 2n + tau(n).

Franklin T. Adams-Watters

-----Original Message-----
From: Eric Angelini <Eric.Angelini at>

Could please someone compute a few terms more of:

< Add to n the n-th smallest number not dividing n >

(this is a kind of self-generalization of the rule herunder)

I've found this first few terms:

S = 1,3,8,20,46,96,...


(not in the OEIS though 1,3,8,20,46 gives 4 hits)

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