A275308 Starting terms for the second half of the Kolakoski sequence.

2, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 2, 2, 2, 1, 2, 1, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 1

Offset: 1

Author

David Spies, Jul 22 2016

Keywords

• nonn
• more

Comments

When building the Kolakoski sequence (A000002) using substitutional generation, this is the first term that comes from the second 2. Or equivalently, this is the first new term added to the previous sequence.

Examples

			.   22
.    ^
.   2211
.     ^
.   221121
.       ^
.   221121221
.         ^
.   22112122122112
.            ^
To obtain the first 5 terms: 2, 1, 2, 2, 2.
		

Crossrefs

Cf. A000002.