40000400001
domain: N
Appears in sequences
- Squares composed of digits {0,1,4}, not ending with zero.at n=16A058414
- a(1) = 1; a(n+1) = smallest square > a(n) with leading digit equal to final digit of a(n) and final digit not 0.at n=21A061449
- Largest n-digit square which leaves a square at every step if most significant digit and least significant digit are deleted until a one- or two-digit square is obtained. a(2n) = 0 if no such square exists. a(2n+1) = 9*10^2n only if no nontrivial candidate exists.at n=10A077486