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A225207
Number of primitive Pythagorean quadruples (a, b, c, d) with d < 10^n.
2
4, 347, 34163, 3412143, 341175325, 34117055318, 3411700692939, 341170025540426, 34117002022924247
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OFFSET
1,1
COMMENTS
a(n) ~ (1+G)*
A225206
(n)/Pi, where G is Catalan's constant (
A006752
).
LINKS
Table of n, a(n) for n=1..9.
Wikipedia,
Pythagorean quadruple
EXAMPLE
a(1) = 4 because there are four primitive solutions (a, b, c, d) as follows: (1, 2, 2, 3), (2, 3, 6, 7), (1, 4, 8, 9), (4, 4, 7, 9) with d < 10.
CROSSREFS
Cf.
A096907
-
A096910
,
A225206
.
Sequence in context:
A332134
A283101
A074844
*
A052391
A214182
A214233
Adjacent sequences:
A225204
A225205
A225206
*
A225208
A225209
A225210
KEYWORD
more
,
nonn
AUTHOR
Arkadiusz Wesolowski
, May 01 2013
EXTENSIONS
a(4) from
Giovanni Resta
, May 01 2013
a(5)-a(9) from
Max Alekseyev
, Feb 28 2023
STATUS
approved
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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)