A058474 Squares composed of digits {0,1,9}, not ending with zero.
1, 9, 1909190001999001011109190090109911991001, 10199000091990191001091091099001091999900190199000001
Offset: 1
Links
- Patrick De Geest, Index to related sequences.
- Shyam Sunder Gupta, Elegance of Squares, Cubes, and Higher Powers, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 2, pp. 29-81.
- Hisanori Mishima, Sporadic tridigital solutions.
Crossrefs
Cf. A058473.
Formula
a(n) = A058473(n)^2. - Elmo R. Oliveira, Jul 17 2025
Extensions
a(4) from Zhao Hui Du, Feb 29 2024