login
A086071
Number of 0's in decimal expansion of triangular number n(n+1)/2.
10
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
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
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jul 08 2003
STATUS
approved