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A120230 Split-floor-multiplier sequence (SFMS) using multipliers 1/4 and 4. (SFMS is defined at A120229.). 4
4, 8, 12, 1, 20, 24, 28, 2, 36, 40, 44, 3, 52, 56, 60, 64, 68, 72, 76, 5, 84, 88, 92, 6, 100, 104, 108, 7, 116, 120, 124, 128, 132, 136, 140, 9, 148, 152, 156, 10, 164, 168, 172, 11, 180, 184, 188, 192, 196, 200, 204, 13, 212, 216, 220, 14, 228, 232, 236, 15, 244, 248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Self-inverse permutation of the natural numbers.

LINKS

Table of n, a(n) for n=1..62.

FORMULA

a(n)=[n/4] if this is positive and new, else a(n)=4n.

EXAMPLE

a(1)=1*4 because [1/4] is not positive.

a(2)=2*4 because [2/4] is not positive.

a(3)=3*4 because [3/4] is not positive.

a(4)=1=[4*(1/4)].

a(5)=5*4 because [5/4]=a(4), not new.

CROSSREFS

Cf. A073675, A120230.

Sequence in context: A109239 A056135 A159586 * A086480 A260249 A277616

Adjacent sequences:  A120227 A120228 A120229 * A120231 A120232 A120233

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jun 11 2006

STATUS

approved

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Last modified January 18 11:50 EST 2019. Contains 319271 sequences. (Running on oeis4.)