45x(adsbygoogle = window.adsbygoogle || []).push({}); ^{2}+15x +/-1. ... 59;61 ,209;211 ,449;451 ,779;781 ...

45x^{2}- 15x +/-1 ... 29;31 ,149;151 ,359;361 ,659;661 ...

Derived from 20x^{2}-1 can only have factors ending in the digit _1, or _9 .

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# B Prime pairs ending in _9 , _1

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