281622domain: NAppears in sequencesNumbers n such that n*((2^61-1)^3) - 1 and n*((2^61-1)^3) + 1 are twin primes.at n=17A099230Numbers k such that k^5-1 and k^5+1 are semiprimes.at n=5A276905a(n) = 324*n^2 - 336*n + 102 (n >= 1).at n=29A304165