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A136998 Numbers n such that n and the square of n use only the digits 1, 2, 4, 7 and 9. 1
1, 2, 7, 11, 12, 21, 27, 171, 212, 421, 479, 2729, 2777, 4911, 4912, 11171, 21729, 44127, 49777, 112912, 119127, 221911, 279271, 471479, 477412, 492921, 497212, 499479, 974229, 1194771, 1214171, 2174229, 2219171, 4412729, 4471479, 4721729, 4794911, 4919271, 4927421, 4929277, 4994777, 4997212, 4997271, 4997277, 4997777, 9997212, 12129271 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Generated with DrScheme

LINKS

Jonathan Wellons, Table of n, a(n) for n=1..540

J. Wellons, Tables of Shared Digits

EXAMPLE

492421742492421^2 = 242479172479272177477242441241

CROSSREFS

Sequence in context: A087723 A299242 A184792 * A136734 A113544 A045173

Adjacent sequences:  A136995 A136996 A136997 * A136999 A137000 A137001

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved

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Last modified June 15 15:16 EDT 2021. Contains 345049 sequences. (Running on oeis4.)