A137050 Numbers k such that k and k^2 use only the digits 1, 4, 5, 7 and 9.

1, 7, 771, 95915479, 1414114479, 9549447479, 9997777479, 44175549479, 444714977479, 744411947479, 7719779447479, 9755999159479, 9795711159479, 9955779977479, 9974955915479, 9975759415479, 44711911155479, 77174797777479, 99571459159479, 757941917114479, 957974171959479, 999597777979479, 999747957114479

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..24

J. Wellons, Tables of Shared Digits [archived]

Example

957974171959479^2 = 917714514141449441154417951441.

Crossrefs

Sequence in context: A248385 A242826 A112904 * A114911 A162089 A020470

Adjacent sequences: A137047 A137048 A137049 * A137051 A137052 A137053

Keyword

base,nonn

Author

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

Status

approved