A136817 Numbers k such that k and k^2 use only the digits 0, 1, 2, 4 and 5.

0, 1, 2, 5, 10, 11, 12, 15, 20, 21, 45, 50, 100, 101, 102, 105, 110, 112, 120, 145, 150, 155, 200, 201, 205, 210, 211, 450, 500, 501, 502, 505, 1000, 1001, 1002, 1005, 1010, 1011, 1012, 1020, 1021, 1050, 1100, 1101, 1102, 1105, 1120, 1200, 1201, 1205, 1245, 1415, 1450, 1451, 1500, 1550, 2000, 2001, 2005, 2010, 2011, 2050, 2100, 2101, 2110, 2245, 4500, 5000, 5001

Offset

1,3

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..1551 (* All terms of 8 digits or less. *)

J. Wellons, Tables of Shared Digits [archived]

Example

50141245^2 = 2514144450150025.

Mathematica

With[{c={0, 1, 2, 4, 5}}, {t=FromDigits/@Tuples[c, 4]}, Select[t, SubsetQ[c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, May 12 2026 *)

Crossrefs

Sequence in context: A144793 A140707 A257086 * A140180 A175324 A056704

Adjacent sequences: A136814 A136815 A136816 * A136818 A136819 A136820

Keyword

base,nonn

Author

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

Extensions

Parenthetical comment added to first link by Harvey P. Dale, May 12 2026

Status

approved