A307077 - cp's OEIS frontend

A307077 Let a(1)=3; for n > 1, let a(n) be the least positive integer k such that k > a(n-1), a(1)^2 + ... + a(n-1)^2 + k^2 is a square and the Pythagorean triple sqrt(a(1)^2 + ... + a(n-1)^2), a(n), sqrt(a(1)^2 + ... + a(n)^2) is primitive.

n	a(n)
1	3
2	4
3	12
4	84
5	132
6	12324
7	89892
8	2447844
9	28350372
10	295742791596
11	171480834409712412
12	633511848768467916
13	1616599508725767821225590810932
14	4158520496012961741299012805876
15	115366949386695884000892071516523067413910188

[3, 4, 12, 84, 132, 12324, 89892, 2447844, 28350372, 295742791596, 171480834409712412, 633511848768467916, 1616599508725767821225590810932, 4158520496012961741299012805876, 115366949386695884000892071516523067413910188]

cp's OEIS Frontend

A307077 Let a(1)=3; for n > 1, let a(n) be the least positive integer k such that k > a(n-1), a(1)^2 + ... + a(n-1)^2 + k^2 is a square and the Pythagorean triple sqrt(a(1)^2 + ... + a(n-1)^2), a(n), sqrt(a(1)^2 + ... + a(n)^2) is primitive.

Table of values

List of values