A080783 - OEIS

A080783

a(1)=1, a(n)=a(n-1)-1 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.

1, 6, 11, 16, 21, 20, 25, 30, 35, 40, 39, 44, 49, 54, 59, 58, 63, 68, 73, 72, 71, 76, 81, 86, 85, 90, 95, 100, 105, 104, 109, 114, 119, 124, 123, 128, 133, 138, 137, 136, 141, 146, 151, 150, 155, 160, 165, 170, 169, 174, 179, 184, 189, 188, 193, 198

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

FORMULA

Conjectured to be asymptotic to 3n as n -> infinity.

MATHEMATICA

lst={1}; i=2; Do[If[MemberQ[lst, i], AppendTo[lst, Last[lst]-1], AppendTo[ lst, Last[lst]+5]]; i++, {60}]; lst (* Harvey P. Dale, Aug 20 2011 *)

CROSSREFS

Cf. A079357, A079354, A080782, A064437.

Sequence in context: A080904 A081746 A080900 * A315457 A315458 A315459

Adjacent sequences: A080780 A080781 A080782 * A080784 A080785 A080786

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Mar 07 2003

STATUS

approved