A259683 Let m = A062695(n); a(n) is value of v in decomposition of m defined in Comments.

17, 41, 13, 1, 1, 1, 11, 23, 1, 7, 1, 113, 1, 53, 97, 1, 313, 1, 11, 353, 1, 193, 1, 1, 1, 7, 1, 1, 31, 1, 1, 13, 33, 43, 29, 31, 7, 1, 1, 1, 241, 1, 1, 7, 1, 433, 127, 89, 1, 1, 197, 1, 1, 17, 1, 29, 1, 85, 53, 33, 29, 1, 1, 577, 15, 1, 1, 79, 1, 1, 1201, 1, 1241

Offset

1,1

Comments

Let m = A062695(n). Write m*y^2 = x^3 - x as m*square = A*B*(A-B)*(A+B) where A and B are the numerator and denominator of x. Then A, B, A-B, A+B have the form s*a^2, t*b^2, u*c^2, v*d^2 for some decomposition of m as s*t*u*v and some natural numbers a,b,c,d. These eight numbers are given in A259680-A259687.

Links

Table of n, a(n) for n=1..73.

G. Kramarz, All congruent numbers less than 2000, Math. Annalen, 273 (1986), 337-340.

G. Kramarz, All congruent numbers less than 2000, Math. Annalen, 273 (1986), 337-340. [Annotated, corrected, scanned copy]

Crossrefs

Cf. A003273, A006991, A062695, A259680-A259687.

Sequence in context: A140679 A346527 A152817 * A078553 A104043 A076330

Adjacent sequences: A259680 A259681 A259682 * A259684 A259685 A259686

Keyword

nonn

Author

N. J. A. Sloane, Jul 04 2015

Extensions

More terms from Jinyuan Wang, Jan 01 2021

Status

approved