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A059495
For odd p such that 2^p-1 is a prime (A000043), write 2^p-1 = x^2+3*y^2; sequence gives values of y.
1
1, 3, 3, 45, 3, 381, 2349, 115329357, 10279641655875, 5033685952807971, 5263826472436016979, 898670952308059000662208200339860406351380028634597445743368513219427297854627, 1163046333059983884005407440923089001865672520479660324278034104804471332063117356524700189
OFFSET
1,2
REFERENCES
F. Lemmermeyer, Reciprocity Laws From Euler to Eisenstein, Springer-Verlag, 2000, p. 59.
LINKS
Phil Moore, Tony Reix and others, Online Discussion
EXAMPLE
p=7: 127 = 10^2 + 3*3^2, so a(3) = 3.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Feb 05 2001
EXTENSIONS
More terms from Joshua Zucker, May 23 2006
STATUS
approved