A057227 - OEIS

A057227

Smallest member of smallest set S(n) of positive integers containing n which satisfies "k is in S, iff 2k-1 is in S, iff 4k is in S".

1, 2, 2, 1, 2, 6, 1, 2, 2, 10, 6, 2, 1, 14, 2, 1, 2, 18, 10, 2, 6, 22, 2, 6, 1, 26, 14, 1, 2, 30, 1, 2, 2, 34, 18, 2, 10, 38, 2, 10, 6, 42, 22, 6, 2, 46, 6, 2, 1, 50, 26, 1, 14, 54, 1, 14, 2, 58, 30, 2, 1, 62, 2, 1, 2, 66, 34, 2, 18, 70, 2, 18, 10, 74, 38, 10, 2, 78, 10, 2, 6, 82, 42, 6, 22

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OFFSET

1,2

COMMENTS

Ratio of number of times 2 appears to number of times 1 appears tends towards (1+sqrt(5))/2. Ratio of number of times 2 appears to number of times 4m+2 appears tends towards ((1+sqrt(5))/2)^log_2(2m+1).

LINKS

Table of n, a(n) for n=1..85.

Michael Gilleland, Some Self-Similar Integer Sequences

EXAMPLE

a(23)=2 since if 23 is in S(23) then so are 12, 3 and 2; however 1 need not be and so the smallest member of S(23) is 2.

CROSSREFS

All values of a(n) are 1 or of form 4m+2, i.e., A016825. a(n)=1 iff n is in A048297.

Sequence in context: A125678 A091562 A106585 * A335190 A283170 A368836

Adjacent sequences: A057224 A057225 A057226 * A057228 A057229 A057230

KEYWORD

nonn

AUTHOR

Henry Bottomley, Nov 23 2000

STATUS

approved