A085625 Numbers that are the sum of 2 squares in exactly 2 ways.

25, 50, 65, 85, 100, 125, 130, 145, 169, 170, 185, 200, 205, 221, 225, 250, 260, 265, 289, 290, 305, 338, 340, 365, 370, 377, 400, 410, 442, 445, 450, 481, 485, 493, 500, 505, 520, 530, 533, 545, 565, 578, 580, 585, 610, 629, 676, 680, 685, 689, 697, 730

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..16794

Formula

n such that A000161(n)=2.

Example

a(3)=65 because 65=8^2+1^2=7^2+4^2,
a(4)=85 because 9^2+2^2=7^2+6^2.

Crossrefs

Cf. A000161, A000446.

Sequence in context: A354379 A009177 A118882 * A116490 A230213 A338890

Adjacent sequences: A085622 A085623 A085624 * A085626 A085627 A085628

Keyword

nonn

Author

Hugo Pfoertner, Jul 09 2003

Status

approved