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A086015 Number of 7's in decimal expansion of n^2. 11
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,77

LINKS

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

MATHEMATICA

DigitCount[(Range[0, 100])^2, 10, 7] (* G. C. Greubel, Dec 13 2016 *)

PROG

(PARI) A086015(n)=#select(d->d==7, 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, 5's A086013, 6's A086014, 8's A086016, 9's A086017.

Cf. A269247 for the n^3 analog.

Sequence in context: A088722 A122180 A033772 * A249856 A086012 A248394

Adjacent sequences:  A086012 A086013 A086014 * A086016 A086017 A086018

KEYWORD

base,nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jul 07 2003

STATUS

approved

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Last modified September 21 15:13 EDT 2017. Contains 292300 sequences.