A171902 First differences of consecutive numbers having at least two identical neighboring digits in decimal representation.

11, 11, 11, 11, 11, 11, 11, 11, 1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 11, 11, 11, 11, 11, 11, 11, 1, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 11, 11, 11, 11, 11, 11, 1, 11, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 11, 11, 11, 11, 11, 1, 11, 11, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 6, 11, 11, 11, 11, 1, 11

Offset: 1

Author

Reinhard Zumkeller, Feb 07 2010

Keywords

• nonn
• base

Comments

a(n) = A171901(n+1) - A171901(n);

1 <= a(n) <= 11;

a(A171903(n)) = 1.

Links

• R. Zumkeller, Table of n, a(n) for n = 1..10000