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A086078 Number of 7's in decimal expansion of triangular number n(n+1)/2. 9
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,60

LINKS

Table of n, a(n) for n=0..104.

CROSSREFS

Cf. 0's A086071, 1's A086072, 2's A086073, 3's A086074, 4's A086075, 5's A086076, 6's A086077, 8's A086079, 9's A086080.

Sequence in context: A056626 A290081 A010103 * A014082 A102354 A193138

Adjacent sequences:  A086075 A086076 A086077 * A086079 A086080 A086081

KEYWORD

base,nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jul 08 2003

STATUS

approved

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Last modified August 21 13:36 EDT 2017. Contains 290890 sequences.