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A086076
Number of 5's in decimal expansion of triangular number n(n+1)/2.
9
0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 2, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 1, 2, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1
OFFSET
0,11
MATHEMATICA
DigitCount[#, 10, 5]&/@Accumulate[Range[0, 110]] (* Harvey P. Dale, Sep 24 2016 *)
CROSSREFS
Cf. 0's A086071, 1's A086072, 2's A086073, 3's A086074, 4's A086075, 6's A086077, 7's A086078, 8's A086079, 9's A086080.
Sequence in context: A351726 A285720 A269175 * A334348 A316717 A328831
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jul 08 2003
STATUS
approved