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A138711
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n-th run has length n-th positive triangular number, with digits 0 and 1 only, starting with 1.
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2
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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; internal format)
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OFFSET
| 1,1
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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
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MATHEMATICA
| Flatten[Table[Join[PadRight[{}, (n(n+1))/2, 1], PadRight[{}, ((n+1)(n+2))/2, 0]], {n, 1, 7, 2}]] (* From Harvey P. Dale, Dec 11 2011 *)
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CROSSREFS
| Cf. A000217, A057211, A138149, A138709.
Sequence in context: A104107 A120532 A004555 * A154281 A154282 A178600
Adjacent sequences: A138708 A138709 A138710 * A138712 A138713 A138714
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 29 2008
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