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A214881 2-adic valuation of A016090. 4
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 (list; graph; refs; listen; history; text; internal format)
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. A214880, A214882, A214883.

Sequence in context: A058189 A069208 A066113 * A163831 A192419 A081836

Adjacent sequences:  A214878 A214879 A214880 * A214882 A214883 A214884

KEYWORD

nonn,base

AUTHOR

Eric M. Schmidt, Jul 29 2012

STATUS

approved

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Last modified August 20 07:48 EDT 2019. Contains 326143 sequences. (Running on oeis4.)