41348domain: NAppears in sequencesNumber of perfect matchings in graph P_{2} X C_{3} X P_{n}.at n=5A028455Least k such that 10^n + k - 1 is the first of a pair of twin primes.at n=51A103129Numbers k such that 6*k-1 = A144796(k).at n=3A144941The number of spheres on which the points defined by A222268 lie.at n=5A268020