27222

Appears in sequences

• a(n) = prime(n)*prime(n-1) + 1.at n=38A023523
• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 1,3.at n=8A025229
• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-2)*a(2) for n >= 3.at n=8A025239
• Triangle read by rows: T(n,k) is the number of isomorphism classes of commutative semigroups of order n with k idempotents.at n=30A058116
• Collatz-2 (A063041) trajectory starting at 29.at n=4A063044
• Collatz-2 (A063041) trajectory starting at 29.at n=19A063044
• Collatz-2 (A063041) trajectory starting at 29.at n=34A063044
• Numbers k such that 2*10^k + R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=5A102949
• Number 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, 0), (-1, 1, -1), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.at n=10A148275
• Number 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, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.at n=10A148770
• The sum of all the entries in an n X n Cayley table for multiplication in Z_n.at n=38A160255
• Number of (w,x,y) with all terms in {0,...,n} and w>=range{w,x,y}.at n=35A212968
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 259", based on the 5-celled von Neumann neighborhood.at n=33A271056
• Numbers n such that Bernoulli number B_{n} has denominator 3318.at n=18A272383
• Numbers with digits 2 and 7 only.at n=38A284921