A064437 -id:A064437 - cp's OEIS frontend

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

Offset: 1

Benoit Cloitre, Mar 07 2003

nonn

Cf. A079357, A079354, A080782, A064437.

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 *)

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

A080705 Numbers n such that A080704(n+1) - A080704(n) = 1.

Original entry on oeis.org

3, 15, 17, 25, 33, 49, 57, 69, 77, 89, 91, 99, 101, 109, 117, 129, 137, 149, 151, 159, 167, 179, 187, 199, 201, 209, 217, 233, 241, 257, 265, 277, 285, 297, 299, 307, 315, 327, 335, 347, 349, 357, 365, 381, 389, 401, 409, 421, 423, 431, 439, 451, 459, 471, 473, 481, 489

Offset: 1

Benoit Cloitre, Mar 01 2003

These are the integers that are the average of a pair of consecutive terms in A080704. - Matthew Vandermast, Mar 06 2003

Cf. A080704, A064437.

cp's OEIS Frontend

A080783 a(1)=1, a(n)=a(n-1)-1 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.

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A080705 Numbers n such that A080704(n+1) - A080704(n) = 1.

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