161407domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers to which Mersenne primes 2^p-1 can be congruent mod k! (for k > 1).at n=20A145038Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (-1, 0, 1), (1, 0, 1), (1, 1, 0)}.at n=9A150696Prime numbersat n=14801