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+3√U13(v+3√3)√13+3√U13(v−3√3)√13)
where U13=3+√132,v=11+√132
Using a similar form, we propose that
G29=131/4(9+√292+3√U29(x+24√3)+3√U29(x−24√3))1/4G53=131/4(23+3√532+3√U53(y+120√3)+3√U53(y−120√3))1/4G61=131/4(15+2√61+3√U61(z+72√3)+3√U61(z−72√3))1/4
whereU29=5+√292,x=185+19√292
U53=7+√532,y=1721+217√532
U61=39+5√612,z=601+93√612
and similarly for all seven prime p=29,53,61,109,157,277,397. Note they have form p≡5mod8. And all their fundamental units have form Up=a+b√p2, hence have odd solutions to the Pell equation x2−py2=−4.
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