A137006 Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 9.

1, 5, 11, 15, 16, 25, 96, 125, 161, 511, 515, 516, 1119, 1125, 1515, 1619, 2261, 5125, 9619, 9961, 12296, 12511, 12515, 16215, 16296, 22619, 22925, 25525, 25596, 51211, 96211, 112515, 125125, 126211, 126969, 129215, 161125, 161219, 226961, 256169, 262925, 511969, 516296, 956619, 959961, 1119219, 1121125, 1126925, 1252965, 1261965, 1262125

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			126961261519525^2 = 16119161926629219511956225625.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..420
• J. Wellons, Tables of Shared Digits [archived]

Programs

Mathematica

With[{c={1,2,5,6,9}},Flatten[Table[FromDigits/@Select[ Tuples[c,n], SubsetQ[ c,IntegerDigits[FromDigits[#]^2]]&],{n,7}]]] (* Harvey P. Dale, Nov 25 2014 *)