A058438 Squares composed of digits {0,4,6}, not ending with zero.

4, 64, 440664064, 466646404, 46400606464, 640060004606400004, 446060064064060664464, 666460646444644406404, 6404064646440406400064, 64004064064644004064000064, 666444044666640606004460644, 64600604644004446466060040004, 64640004404460064604400600064

Offset: 1

Author

Patrick De Geest, Nov 15 2000

Keywords

• nonn
• base

Comments

Includes all numbers of the form (8*100^k + 254*10^k + 8)^2 for k >= 5.

Links

• Zhao Hui Du, Table of n, a(n) for n = 1..25
• Patrick De Geest, Index to related sequences
• Hisanori Mishima, Sporadic tridigital solutions

Crossrefs

Cf. A058437.

Formula

a(n) = A058437(n)^2. - Andrew Howroyd, Oct 18 2024