A158894 Sawtooth pattern of one, then two, then three, then four etc. consecutive odd numbers, starting each time at 3.

3, 3, 5, 3, 5, 7, 3, 5, 7, 9, 3, 5, 7, 9, 11, 3, 5, 7, 9, 11, 13, 3, 5, 7, 9, 11, 13, 15, 3, 5, 7, 9, 11, 13, 15, 17, 3, 5, 7, 9, 11, 13, 15, 17, 19, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 3, 5, 7, 9, 11, 13, 15, 17, 19

Offset: 1

Author

Paul Curtz, Mar 29 2009

Keywords

• nonn
• easy
• changed

Comments

Obtained from A158405 by deleting the 1's, or from A141620 by deleting the positive numbers and flipping all signs.

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A158405, A141620, A000124.

Programs

Mathematica

sp[n_]:=Module[{cl=Range[3,51,2],l={}},Table[l=Join[l,Take[cl,i]], {i,n}];l ]; sp[15] (* Harvey P. Dale, Oct 30 2011 *)
Table[Range[3,2n+1,2],{n,15}]//Flatten (* Harvey P. Dale, Jun 27 2025 *)

PARI

forstep(m=3,9,2,forstep(n=3,m,2,print1(n", "))) \\ Charles R Greathouse IV, Oct 30 2011

Formula

a(A000124(i))=3, i>=0. - R. J. Mathar, Apr 04 2009

Extensions

Edited by R. J. Mathar, Apr 04 2009

Corrected by Harvey P. Dale, Oct 30 2011