Let k be the least integer such that n^2 + Sum_{m=1..k} m^2 is a perfect square, then a(n) is the resulting square.
A065611
Let k be the least integer such that n^2 + Sum_{m=1..k} m^2 is a perfect square, then a(n) is the resulting square.
Terms
- a(0) =1a(1) =35721a(2) =9a(3) =64a(4) =150700176a(5) =1521a(6) =1718434116a(7) =3844a(8) =1849a(9) =900a(10) =2209a(11) =474721a(12) =529a(13) =116964a(14) =400a(15) =419845682025a(16) =618399795456a(17) =3600a(18) =187489a(20) =10816a(21) =1681a(22) =5560164a(23) =2025a(24) =961a(25) =1444a(26) =961a(27) =784a(28) =41209
External references
- oeis: A065611