login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181524 Table read by rows in which n-th row gives the smallest solution (a,b,c,d) to the partition (4n+1)^2 = a^2 + b^2 + c^2 + d^2 with 0 < a < b < c < d. 1

%I #12 Apr 01 2018 13:07:37

%S 2,4,5,6,1,2,8,10,2,4,10,13,1,2,6,20,2,3,6,24,1,8,10,26,2,3,20,26,1,4,

%T 14,34,1,4,8,40,1,2,16,42,1,4,28,40,1,2,10,52,1,4,36,44,1,2,40,46,1,8,

%U 32,56,1,2,20,66,1,16,44,56,1,2,32,70,1,4,12,80,1,2,38,76,2,4,26,85,1,2,30,88,1,8,40,88,1,2,14,100,1,8,12,104,1,2,74,80,1,4,44,104,1,4,26,114,1,4,68,100,1,6,72,102,1,32,80,96,1,2,28,130,1,4,16,136,1,2,74,120,1,4,68,128,1,10,14,148,2,3,70,136,1,2,88,130,1,8,16,160

%N Table read by rows in which n-th row gives the smallest solution (a,b,c,d) to the partition (4n+1)^2 = a^2 + b^2 + c^2 + d^2 with 0 < a < b < c < d.

%C Solutions to the Diophantine partition of (4n+1)^2 into 4 distinct nonzero squares are counted in A175958.

%C The table contains four numbers a,b,c,d in row n illustrating one particular solution, minimizing a, if there are two solutions with the same a minimizing b etc.

%e The table starts in row n=2 as

%e 2, 4, 5, 6; # 2^2 + 4^2 + 5^2 + 6^2 = (4*2+1)^2

%e 1, 2, 8, 10; # 1^2 + 2^2 + 8^2 + 10^2 = (4*3+1)^2

%e 2, 4, 10, 13; # 2^2 + 4^2 + 10^2 + 13^2 = (4*4+1)^2

%K nonn,tabf

%O 2,1

%A Pedro Fernandez (fourier07(AT)gmail.com), Oct 26 2010

%E Replaced the 4 terms with a generic definition; connected to A175958 - _R. J. Mathar_, Nov 17 2010

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)