A136856 Numbers k such that k and k^2 use only the digits 0, 1, 4, 5 and 7.

0, 1, 10, 71, 100, 710, 1000, 1071, 7100, 7451, 10000, 10701, 10710, 70751, 71000, 74510, 75501, 100000, 100501, 107010, 107100, 107451, 707510, 710000, 745100, 745501, 755010, 1000000, 1005010, 1007001, 1070100, 1071000, 1074510, 4140701, 7075100, 7100000, 7100501, 7451000, 7455010, 7550100, 10000000, 10005001, 10005071, 10050100

Offset

1,3

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..571

Jonathan Wellons, Tables of Shared Digits

Example

745050410475701^2 = 555100114150010550401111441401.

Crossrefs

Cf. A000290.

Sequence in context: A246427 A172499 A215295 * A016218 A026772 A224292

Adjacent sequences: A136853 A136854 A136855 * A136857 A136858 A136859

Keyword

base,nonn

Author

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

Status

approved