A080066 First differences of A000966 (number of zeros that n! will never end in).

6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 1, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 1, 6

Offset: 1

Author

Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 24 2003

Keywords

• base
• nonn

Comments

All terms in this sequence are either 1 or 6. - Charles R Greathouse IV, Jan 30 2023

The positions of 1 in this sequence are A000966, the sequence from which the differences were obtained. - Paul C Abbott, May 12 2025

Examples

			E.g. A000966(5)=29, A000966(4)=23, so a(4)=29-23=6.
		

Crossrefs

Cf. A000966.

Cf. A000142, A027868.

Formula

a(n) = A000966(n+1) - A000966(n).

Extensions

More terms from Sascha Kurz, Jan 27 2003