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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

Adjacent sequences:  A061860 A061861 A061862 * A061864 A061865 A061866

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

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Last modified October 28 11:38 EDT 2021. Contains 348329 sequences. (Running on oeis4.)