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A048147 Array T read by diagonals; T(i,j) = i^2 + j^2. 4
0, 1, 1, 4, 2, 4, 9, 5, 5, 9, 16, 10, 8, 10, 16, 25, 17, 13, 13, 17, 25, 36, 26, 20, 18, 20, 26, 36, 49, 37, 29, 25, 25, 29, 37, 49, 64, 50, 40, 34, 32, 34, 40, 50, 64, 81, 65, 53, 45, 41, 41, 45, 53, 65, 81, 100, 82, 68, 58, 52, 50, 52, 58, 68 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

For any i,j >=0 a(i)*a(j) is a member of this sequence, since (a^2 + b^2)*(c^2 + d^2) = (a*c + b*d)^2 + (a*d - b*c)^2. - Boris Putievskiy, May 05 2013

LINKS

Table of n, a(n) for n=0..63.

EXAMPLE

Diagonals (each starting on row 1): {0}; {1,1}; {4,2,4}; ...

CROSSREFS

Cf. A006331.

Sequence in context: A137718 A007361 A128136 * A203001 A051666 A011382

Adjacent sequences:  A048144 A048145 A048146 * A048148 A048149 A048150

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 29 00:58 EDT 2020. Contains 333104 sequences. (Running on oeis4.)