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A064214 Least k such that k*5^n +/- 1 are twin primes. 0

%I

%S 4,6,6,24,42,42,18,198,42,54,96,84,522,240,48,228,708,732,660,132,528,

%T 390,78,1014,504,1008,1134,504,708,582,894,516,2982,810,162,1746,4758,

%U 1848,414,4512,2928,1722,4392,1104,1134,1950,390,78,1500,300,60

%N Least k such that k*5^n +/- 1 are twin primes.

%t Do[ k = 1; While[ ! PrimeQ[ k*5^n + 1 ] || ! PrimeQ[ k*5^n - 1 ], k++ ]; Print[ k ], {n, 0, 50} ]

%Y Cf. A063983.

%K nonn

%O 1,1

%A _Robert G. Wilson v_, Sep 21 2001

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Last modified January 19 03:18 EST 2020. Contains 331031 sequences. (Running on oeis4.)