login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A120235
Split-floor-multiplier sequence (SFMS) using multipliers 2/5 and 5/2. (SFMS is defined at A120229.).
1
2, 5, 1, 10, 12, 15, 17, 3, 22, 4, 27, 30, 32, 35, 6, 40, 42, 7, 47, 8, 52, 55, 9, 60, 62, 65, 67, 11, 72, 75, 77, 80, 13, 85, 14, 90, 92, 95, 97, 16, 102, 105, 107, 110, 18, 115, 117, 19, 122, 20, 127, 130, 21, 135, 140, 142, 23, 147, 24, 152, 155, 25, 160, 26, 165, 167
OFFSET
1,1
COMMENTS
A permutation of the natural numbers.
FORMULA
a(n)=[2n/5] if this is positive and new, else a(n)=[5n/2].
CROSSREFS
Sequence in context: A010588 A085358 A146104 * A323411 A089618 A207629
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 11 2006
STATUS
approved