A053963 Squares composed of digits {4,7,8}.
4, 484, 784, 7744, 7478444484, 8878844747774884, 84788447488748874848488744487874447844, 484844884744844787448744774844887478884, 48784888484784787487448774777744787448847474447478448784
Offset: 1
Links
- Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.
- Hisanori Mishima Squares consisted of 3 different digits. [From _Max Alekseyev_, Mar 10 2009]
Crossrefs
Cf. A053962.
Formula
a(n) = A053962(n)^2. - Elmo R. Oliveira, Jul 18 2025
Extensions
a(7)-a(8) from Mishima's page added by Max Alekseyev, Mar 10 2009
a(9) from Zhao Hui Du, Mar 10 2024