A137075 Numbers k such that k and k^2 use only the digits 2, 3, 4, 7 and 9.

2, 3, 7, 27, 223, 473, 4943, 49777, 222327, 273393, 477277, 499423, 499473, 973393, 2733943, 4932923, 4993443, 4994777, 4997927, 49342927, 49924277, 49972927, 49993443, 49994223, 49994777, 97339223, 492942927, 494342927, 497332327, 497794473, 497993923, 499293443, 499932923, 499947327, 499972927, 499979277, 499979327

Offset

1,1

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..200

J. Wellons, Tables of Shared Digits [archived]

Example

497242372972927^2 = 247249977479747443472274947329.

Crossrefs

Sequence in context: A264829 A156142 A052877 * A270347 A060412 A276665

Adjacent sequences: A137072 A137073 A137074 * A137076 A137077 A137078

Keyword

base,nonn,changed

Author

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

Status

approved