A236421 Largest value of x such that x^2 + y^2 = P, where P is the product of the first n primes of the form 4k + 1, and 0 < x < y.

1, 4, 23, 122, 743, 4851, 35579, 279644, 2390953, 22510892, 222505867, 2236298893, 23344760669, 248205367341, 2905133255201, 35462464074278, 444339941124303, 5844308003978966, 78628682982091847, 1092345114491353169, 15331801966256295943

Offset

1,2

Links

Table of n, a(n) for n=1..21.

Example

a(3) = 23 because the solutions to x^2 + y^2 = 5*13*17 are (x,y) = (23,24), (9,32), (4,33), (12,31) of which the largest value of x is 23.

Crossrefs

Cf. A236381, A236382, A236422.

Cf. A002144.

Sequence in context: A015532 A144465 A024050 * A227639 A291026 A239399

Adjacent sequences: A236418 A236419 A236420 * A236422 A236423 A236424

Keyword

nonn

Author

Colin Barker, Jan 25 2014

Status

approved