A138712 -id:A138712 - cp's OEIS frontend

A138885 n-th run has length n-th nonprime number, with digits 0 and 1 only, starting with 1.

1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 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, 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

Offset: 1

Omar E. Pol, Apr 06 2008

			.n ..... Run ................... Length
.1 ..... 1 ..................... 1
.2 ..... 0,0,0,0 ............... 4
.3 ..... 1,1,1,1,1,1 ........... 6
.4 ..... 0,0,0,0,0,0,0,0 ....... 8
.5 ..... 1,1,1,1,1,1,1,1,1 ..... 9

Nonprime numbers: A018252. Cf. A057211, A138149, A138150, A138709, A138710, A138711, A138712, A138886.

Join[{1},{PadRight[{},#[[1]],0],PadRight[{},#[[2]],1]}&/@Partition[Select[Range[ 20],CompositeQ],2]]//Flatten (* Harvey P. Dale, May 26 2023 *)

A138886 n-th run has length n-th nonprime number A018252, with digits 0 and 1 only, starting with 0.

Original entry on oeis.org

0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Omar E. Pol, Apr 06 2008

Also the n-th run has length A141468, with digits 0 and 1 only, starting with 1.

			.n ..... Run ................... Length
.1 ..... 0 ..................... 1
.2 ..... 1,1,1,1 ............... 4
.3 ..... 0,0,0,0,0,0 ........... 6
.4 ..... 1,1,1,1,1,1,1,1 ....... 8
.5 ..... 0,0,0,0,0,0,0,0,0 ..... 9

Cf. A057211, A138149, A138150, A138709, A138710, A138711, A138712, A138885.

cp's OEIS Frontend

A138885 n-th run has length n-th nonprime number, with digits 0 and 1 only, starting with 1.

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