A086071 Number of 0's in decimal expansion of triangular number n(n+1)/2.

1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 2, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 2, 0, 0, 0, 1

Offset

0,25

Links

Paolo Xausa, Table of n, a(n) for n = 0..10000

Example

tri(4)=10, so a(4)=1 and tri(24)=300, so a(24)=2.

Mathematica

DigitCount[Accumulate[Range[0, 100]], 10, 0] (* Paolo Xausa, May 05 2024 *)

Crossrefs

Cf. 1's A086072, 2's A086073, 3's A086074, 4's A086075, 5's A086076, 6's A086077, 7's A086078, 8's A086079, 9's A086080.

Cf. A000217.

Sequence in context: A335460 A367077 A368073 * A322212 A089813 A343023

Adjacent sequences: A086068 A086069 A086070 * A086072 A086073 A086074

Keyword

base,nonn

Author

Jason Earls, Jul 08 2003

Status

approved