A065690 a(1) = 0; for n > 1, a(n) is the square root of the smallest square > a(n-1)^2 with a(n-1)^2 forming its final digits.

0, 10, 90, 410, 12090, 4699590, 1762700012090, 60424089429999995300410, 163858711658690481272000000000001762700012090, 284443295612274221167414335130587074570377999999999999999999999939575910570000004699590

Offset: 1

Author

Klaus Brockhaus, Nov 17 2001

Keywords

• base
• nonn

Comments

a(n) = 10*A050635(n-1) for n > 1; a(n) = sqrt(A065689(n)).

Crossrefs

Cf. A050634, A050635, A061359, A065689, A065691.