This site is supported by donations to The OEIS Foundation.

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A086012 Number of 4's in decimal expansion of n^2. 11
 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 1, 2, 2, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 2, 0, 1, 1, 1, 2, 2, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 1, 0, 0, 0, 1, 1, 0, 0, 0, 2, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,13 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 MATHEMATICA DigitCount[(Range[0, 100])^2, 10, 4] (* G. C. Greubel, Dec 13 2016 *) PROG (PARI) A086012(n)=#select(d->d==4, digits(n^2)) \\ M. F. Hasler, Feb 21 2016 CROSSREFS Cf. 0's A086008, 1's A086009, 2's A086010, 3's A086011, 5's A086013, 6's A086014, 7's A086015, 8's A086016, 9's A086017. Cf. A269244 for the n^3 analog. Sequence in context: A033772 A086015 A249856 * A248394 A127268 A252459 Adjacent sequences:  A086009 A086010 A086011 * A086013 A086014 A086015 KEYWORD base,nonn AUTHOR Jason Earls (zevi_35711(AT)yahoo.com), Jul 07 2003 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.