OFFSET
1,1
COMMENTS
FORMULA
EXAMPLE
The first pairs [x2(n), y2(n)] of the fundamental positive solutions of this second class are (the prime A007519(n) appears as first entry):
[17, [9, 7]], [41, [11, 9]], [73, [13, 11]],
[89, [19, 15]], [97, [25, 19]], [113, [15, 13]],
[137, [21, 17]], [193, [23, 19]], [233, [35, 27]],
[241, [41, 31]], [257, [25, 21]], [281, [21, 19]],
[313, [37, 29]], [337, [49, 37]], [353, [23, 21]],
[401, [39, 31]], [409, [29, 25]], [433, [25, 23]],
[449, [57, 43]], [457, [35, 29]], [521, [27, 25]],
[569, [59, 45]], [577, [65, 49]], [593, [33, 29]],
[601, [43, 35]], [617, [29, 27]], [641, [49, 39]], ...
a(4) = -(3*3 - 4*7) = 28 - 9 = 19.
CROSSREFS
KEYWORD
AUTHOR
Wolfdieter Lang, Feb 18 2015
STATUS
approved