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

1,2

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

Prog

(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;

Crossrefs

Cf. A016090, A214880, A214882, A214883.

Sequence in context: A333645 A066113 A363156 * A364085 A163831 A326399

Adjacent sequences: A214878 A214879 A214880 * A214882 A214883 A214884

Keyword

nonn,base

Author

Eric M. Schmidt, Jul 29 2012

Status

approved