A077725 a(n) = smallest square > 1 which can be expressed as a sum of distinct powers of n.

4, 4, 4, 25, 36, 49, 9, 9, 100, 121, 144, 169, 196, 16, 16, 289, 324, 361, 400, 441, 484, 529, 25, 25, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 36, 36, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 49, 49, 2500, 2601, 2704, 2809, 2916

Offset: 2

Author

Amarnath Murthy, Nov 19 2002

Keywords

• nonn

Comments

a(n) = smallest square whose base n representation contains only 0's and 1's.

Crossrefs

Cf. A077724.

Formula

a(1) = 4, a(k^2-1) = a(k^2) = k^2, a(n) = n^2 otherwise. - Charlie Neder, Mar 08 2019

Extensions

Corrected and extended by Ray Chandler, Sep 04 2003