A214881 2-adic valuation of A016090.

1, 2, 3, 5, 5, 6, 8, 8, 9, 13, 14, 14, 14, 14, 15, 17, 17, 18, 21, 21, 22, 23, 26, 26, 26, 26, 27, 28, 30, 30, 31, 32, 34, 34, 36, 36, 38, 38, 39, 42, 41, 48, 43, 44, 49, 46, 47, 49, 52, 51, 51, 52, 53, 56, 56, 56, 63, 58, 59, 60, 61, 65, 64, 64, 66, 66, 67

Offset: 1

Author

Eric M. Schmidt, Jul 29 2012

Keywords

• nonn
• base

Comments

a(n) >= n.

It appears that the density of n such that a(n) = n is 1/2.

Links

• Eric M. Schmidt, Table of n, a(n) for n = 1..10000
• Index entries for sequences related to automorphic numbers

Crossrefs

Cf. A016090, A214880, A214882, A214883.

Programs

GAP

A214881 := function(max) local result, i; result := [6]; for i in [2..max] do Add(result, (2*result[i-1] - result[i-1]^2) mod 10^i); od; result := List(result, x->Valuation(x, 2)); return result; end;