A086013 Number of 5's in decimal expansion of n^2.

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

Offset

0,76

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

Mathematica

DigitCount[(Range[0, 110])^2, 10, 5] (* Harvey P. Dale, Jul 26 2016 *)

Prog

(PARI) A086013(n)=#select(d->d==5, digits(n^2)) \\ M. F. Hasler, Feb 21 2016

Crossrefs

Cf. 0's A086008, 1's A086009, 2's A086010, 3's A086011, 4's A086012, 6's A086014, 7's A086015, 8's A086016, 9's A086017.

Cf. A269245 for the n^3 analog.

Sequence in context: A288558 A362831 A269241 * A340671 A167687 A064692

Adjacent sequences: A086010 A086011 A086012 * A086014 A086015 A086016

Keyword

base,nonn

Author

Jason Earls, Jul 07 2003

Status

approved