The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A138711 n-th run has length n-th positive triangular number, with digits 0 and 1 only, starting with 1. 2
 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..84. EXAMPLE .n ..... Run ............................... Length .1 ..... 1 ................................. 1 .2 ..... 0,0,0 ............................. 3 .3 ..... 1,1,1,1,1,1........................ 6 .4 ..... 0,0,0,0,0,0,0,0,0,0 ............... 10 .5 ..... 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ..... 15 MATHEMATICA Flatten[Table[Join[PadRight[{}, (n(n+1))/2, 1], PadRight[{}, ((n+1)(n+2))/2, 0]], {n, 1, 7, 2}]] (* Harvey P. Dale, Dec 11 2011 *) CROSSREFS Cf. A000217, A057211, A138149, A138709. Sequence in context: A004555 A200261 A288855 * A285617 A246500 A185114 Adjacent sequences: A138708 A138709 A138710 * A138712 A138713 A138714 KEYWORD easy,nonn AUTHOR Omar E. Pol, Mar 29 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 8 00:26 EDT 2023. Contains 363157 sequences. (Running on oeis4.)