A025486 Least k with A025485(k) = n.

0, 3, 5, 10, 26, 170, 7226, 13053770, 42600227803226, 453694852221687377444001770, 51459754733114686962148583993443846186613037940783226

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Formula

For n >= 4, a(n) = a(n-1)^2/4+1.

Conjecture: a(n) = A006892(n+1)+3 for n >= 3. - R. J. Mathar, Apr 23 2007

Extensions

Title corrected and missing a(1)=3 inserted by Sean A. Irvine, Aug 31 2019