A137121 Numbers k such that k and k^2 use only the digits 3, 4, 5, 6 and 7.

6, 66, 74, 76, 666, 744, 6666, 6734, 6756, 7574, 57756, 66666, 66756, 67434, 67656, 74474, 74476, 577734, 666666, 666756, 667334, 667566, 667656, 745356, 745476, 6666666, 6666756, 6667566, 6667656, 6674334, 6734744, 6756734, 7373376, 7453574, 7465744, 7466434, 7533576, 7574744, 66666666, 66666756, 66667566, 66667656, 66673334

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			757473746453656^2 = 573766476566537535636555766336.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..224
• J. Wellons, Tables of Shared Digits [archived]