49145
domain: N
Appears in sequences
- a(n) is the least k such that (k*prime(n)#)^2 + 1, ((k+1)*prime(n)#)^2 + 1 and ((k+2)*prime(n)#)^2 + 1 are 3 primes, where prime(n)# is the n-th primorial.at n=41A098765
- a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4).at n=17A145028
- Partial sums of A162396.at n=24A164120
- Number of partitions of n into two sorts of parts having exactly 3 parts of the second sort.at n=17A258473
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 251", based on the 5-celled von Neumann neighborhood.at n=7A271017
- Trajectory of 48 under the map x -> A289667(x).at n=11A290350
- a(2*n) = 9*2^n - 7, a(2*n+1) = 3*2^(n+2) - 7.at n=25A354789