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Wall–Sun–Sun prime : ウィキペディア英語版
Wall–Sun–Sun prime

In number theory, a Wall–Sun–Sun prime or Fibonacci–Wieferich prime is a certain kind of prime number which is conjectured to exist, although none are known.
== Definition ==
A prime ''p'' ≠ 2, 5 is called a Wall–Sun–Sun prime if ''p''2 divides the Fibonacci number F_, where the Legendre symbol \textstyle\left(\frac\right) has the values
:\left(\frac\right) = \begin 1 &\textp \equiv \pm1 \pmod 5\\ -1 &\textp \equiv \pm2 \pmod 5 \end
Equivalently, a prime ''p'' is a Wall–Sun–Sun prime iff ''Lp'' ≡ 1 (mod ''p''2), where ''Lp'' is the ''p''-th Lucas number.
A ''k''-Wall-Sun-Sun prime is defined as a prime ''p'' such that ''p''2 divides the ''k''-Fibonacci number (a Lucas sequence ''Un'' with (P, Q) = (''k'', -1)) F_k(), where \left(\frac\right) is the Legendre symbol. For example, 241 is a ''k''-Wall-Sun-Sun prime for ''k'' = 3. Thus, a prime ''p'' is a ''k''-Wall-Sun-Sun prime iff ''Vk(p)'' ≡ 1 (mod ''p''2), where ''Vn'' is a Lucas sequence with (P, Q) = (''k'', -1).
Least ''n''-Wall-Sun-Sun prime are
:13, 241, 2, 3, 191, 5, 2, 3, 2683, ... (start with ''n'' = 2)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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