Processing math: 100%

Saturday, June 14, 2025

Entry 171

Continuing from Entry 170, there is another way to express the Ramanujan Gn-function where d=4n for prime n has class number 6 by using fundamental units Un. Borrowing a trick from Ramanujan, he found

G169=13(2+13+3U13(v+33)13+3U13(v33)13)

where U13=3+132,v=11+132

Using a similar form, we propose that

G29=131/4(9+292+3U29(x+243)+3U29(x243))1/4G53=131/4(23+3532+3U53(y+1203)+3U53(y1203))1/4G61=131/4(15+261+3U61(z+723)+3U61(z723))1/4

whereU29=5+292,x=185+19292
U53=7+532,y=1721+217532
U61=39+5612,z=601+93612

and similarly for all seven prime p=29,53,61,109,157,277,397. Note they have form p5mod8. And all their fundamental units have form Up=a+bp2, hence have odd solutions to the Pell equation x2py2=4.

No comments:

Post a Comment