A309073 Split the sequence A247476 into nonempty chunks of minimal length such that for d = 1..9, the number of terms with leading digit d is even; a(n) is the length of the n-th chunk.

26, 6, 6, 76, 14, 12, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 712, 38, 280, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6

Offset: 1

Author

Rémy Sigrist, Jul 10 2019

Keywords

• nonn
• base

Comments

This sequence corresponds to the first difference of A309063.

Examples

			See illustration of first terms in Links section.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, Illustration of first terms

Crossrefs

Cf. A247476, A309063, A309072.

Formula

a(n) = A309063(n+1) - A309063(n).

a(n) = A055642(A309072(n)).