120521domain: NAppears in sequencesNumber of 0..n arrays x(0..5) of 6 elements with zero 5th difference.at n=15A200157Odd numbers m such that for all 2^k < m the numbers m + 2^k, m - 2^k, m*2^k + 1, and m*2^k - 1 are composite, with k >= 1.at n=13A256163