A234311 Least number which can be written as a sum of at least 2 consecutive squares in at least n different ways.

5, 365, 147441, 554503705

Offset: 1

Author

M. F. Hasler, Dec 23 2013

Keywords

• nonn
• hard
• more

Comments

No more terms < 10^18. [Lars Blomberg, Jun 02 2014]

Examples

			a(1) = 5 = 1^2 + 2^2.
a(2) = 365 = 10^2 + 11^2 + 12^2 = 13^2 + 14^2.
a(3) = 147441 = 85^2+...+101^2 = 29^2+...+77^2 = 18^2+...+76^2.
a(4) = 554503705 = 480^2+...+1210^2 = 3570^2+...+3612^2 = 3613^2+...+3654^2 = 7442^2+...+7451^2.
		

Crossrefs

Cf. A174069, A062681, A111044.