This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A139438 Frieze pattern with 5 rows, read by diagonals. 2
 1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 3, 5, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Period 15: repeat [1, 1, 2, 3, 1, 1, 3, 5, 2, 1, 1, 2, 1, 1, 1]. - Wesley Ivan Hurt, Jun 05 2016 LINKS James Propp, The combinatorics of frieze patterns and Markoff numbers, arXiv:math/0511633v4. FORMULA Four adjacent entries ...A... .B...C. ...D... satisfy D = (BC-1)/A. EXAMPLE The frieze pattern is ... 1 1 1 1 1 1 1 ... .....1 3 2 1 3 2 ... ....1 2 5 1 2 5 1 ... .....1 3 2 1 3 2 ... ... 1 1 1 1 1 1 1 ... CROSSREFS Cf. A139434, A139458. Sequence in context: A141071 A004648 A265848 * A135392 A071947 A139343 Adjacent sequences:  A139435 A139436 A139437 * A139439 A139440 A139441 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Jun 09 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 6 04:14 EST 2019. Contains 329784 sequences. (Running on oeis4.)