login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A048351 a(n)^2 is the smallest square containing exactly n 6's. 2
4, 26, 216, 1291, 5164, 68313, 163284, 785294, 3559026, 26393686, 129099069, 254296413, 816435342, 4081257976, 80413106314, 215329205326, 2463064689907, 5165911014784, 24832773982716, 81401883640163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(21) > 10^14. - Giovanni Resta, Jul 27 2018

LINKS

Table of n, a(n) for n=1..20.

Eric Weisstein's World of Mathematics, Square Number

MATHEMATICA

a[n_] := Module[{i = 1}, While[DigitCount[i^2][[6]] != n, i++; ]; i]; (* Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006 *)

CROSSREFS

Cf. A036513, A034988.

Sequence in context: A283828 A306028 A164101 * A224734 A143436 A135884

Adjacent sequences:  A048348 A048349 A048350 * A048352 A048353 A048354

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Mar 15 1999

EXTENSIONS

816435342 from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006

a(14), a(15) from Jon E. Schoenfield, Jan 14 2009

a(16) from Jon E. Schoenfield, Jan 24 2009

a(17)-a(20) from Giovanni Resta, Jul 27 2018

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 26 09:38 EST 2021. Contains 340435 sequences. (Running on oeis4.)