A145057 First differences of A031443.

2, 7, 1, 2, 23, 2, 1, 3, 1, 2, 5, 1, 2, 4, 79, 4, 2, 1, 5, 2, 1, 3, 1, 2, 7, 2, 1, 3, 1, 2, 5, 1, 2, 4, 11, 2, 1, 3, 1, 2, 5, 1, 2, 4, 9, 1, 2, 4, 8, 287, 8, 4, 2, 1, 9, 4, 2, 1, 5, 2, 1, 3, 1, 2, 11, 4, 2, 1, 5, 2, 1, 3, 1, 2, 7, 2, 1, 3, 1, 2, 5, 1, 2, 4, 15, 4, 2, 1, 5, 2, 1, 3, 1, 2, 7, 2, 1, 3, 1, 2, 5, 1

Offset: 1

Author

Reikku Kulon, Sep 30 2008

Keywords

• nonn
• easy
• base

Comments

a(n) equals the differences between k where A145037(k) equals zero. - Reikku Kulon, Oct 02 2008

Examples

			a(3) = A031443(3) - A031443(3-1) = 10 - 9 = 1. - _David A. Corneth_, Apr 26 2022
		

Links

• David A. Corneth, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A031443, A145037.

Programs

Mathematica

Differences[Select[Range[0, 1000], SameQ@@DigitCount[#, 2] &]] (* Paolo Xausa, Nov 16 2024 *)