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!)
A137144 Numbers n such that n and the square of n use only the digits 4, 6, 7 and 8. 1
8, 88, 8874, 68474, 86478 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Generated with DrScheme.

No further terms up to and including 1000000. - Harvey P. Dale, Dec 03 2010

LINKS

Table of n, a(n) for n=1..5.

J. Wellons, Tables of Shared Digits

EXAMPLE

86478^2 = 7478444484.

MATHEMATICA

clearQ[n_]:=Module[{dc=DigitCount[n]}, dc[[1]]==dc[[2]]==dc[[3]]==dc[[5]]==dc[[9]]==dc[[10]]==0]

Select[Range[1000000], clearQ[#]&&clearQ[#^2]&] (* Harvey P. Dale, Dec 03 2010 *)

CROSSREFS

Sequence in context: A271268 A006750 A082783 * A107677 A084005 A137494

Adjacent sequences:  A137141 A137142 A137143 * A137145 A137146 A137147

KEYWORD

base,nonn

AUTHOR

Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008

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 June 21 13:09 EDT 2021. Contains 345364 sequences. (Running on oeis4.)