The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A061863 Numbers that are the product of the squares of some subset of their digits. 2
0, 1, 25, 36, 784, 1764, 2916, 36864, 46656, 82944, 746496, 777924, 49787136, 329204736, 429981696, 914457600, 3186376704, 3657830400, 3749847696, 3869835264, 7169347584, 14999390784, 19297377225, 22658678784, 149824733184, 166659897600, 247669456896 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Charlie Neder, Table of n, a(n) for n = 1..248 (Terms < 10^36)
EXAMPLE
784 = (7.4)^2
MATHEMATICA
Join[{0}, Select[Range[100000], MemberQ[Times@@@(Subsets[IntegerDigits[#], IntegerLength[#] -1]^2), #]&]] (* To generate all of the terms of the sequence shown above, increase the "Range" to 10^11, but the program will run a very long time. *) (* Harvey P. Dale, Nov 25 2011 *)
CROSSREFS
Sequence in context: A167363 A035383 A179803 * A079270 A253025 A127022
KEYWORD
base,nice,nonn
AUTHOR
Erich Friedman, Jun 23 2001
EXTENSIONS
More terms from Naohiro Nomoto, Jun 25 2001
a(24)-a(27) from Charlie Neder, Dec 21 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 05:29 EDT 2024. Contains 373423 sequences. (Running on oeis4.)