The first of four consecutive positive integers the sum of the squares of which is equal to the sum of the squares of twenty-one consecutive positive integers.
A261995
The first of four consecutive positive integers the sum of the squares of which is equal to the sum of the squares of twenty-one consecutive positive integers.
Terms
- a(0) =42a(1) =123a(2) =315a(3) =1827a(4) =4659a(5) =13650a(6) =34794a(7) =201114a(8) =512610a(9) =1501539a(10) =3827187a(11) =22120875a(12) =56382603a(13) =165155802a(14) =420955938a(15) =2433095298a(16) =6201573882a(17) =18165636843a(18) =46301326155a(19) =267618362067a(20) =682116744579
External references
- oeis: A261995