23387

Appears in sequences

• In the triangle 1 / 1*2 2*3 / 1*2*3 2*3*4 3*4*5 / ... if every number k is replaced by prime(k) one gets the following triangle 2 / 6 15 / 30 105 385 / 210 1155 5005 17017 / ... Sequence contains the row sums.at n=3A092957
• a(n) is the number of distinct products b_1*b_2*...*b_n where 1 <= b_i <= n.at n=10A110713
• Number of nondecreasing integer sequences of length 14 with sum zero and sum of absolute values 2n.at n=14A158148
• Displacement under constant discrete unit surge.at n=12A207361
• Partial sums of 3-almost primes which are again 3-almost primes, i.e., have exactly 3 not necessarily distinct prime factors.at n=31A217018
• Consider the 2^n values of A147562(i)/i^2 for 2^n <= i < 2^(n+1); a(n) = value of i where this quantity is minimized.at n=14A260239
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 721", based on the 5-celled von Neumann neighborhood.at n=25A273447
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 233", based on the 5-celled von Neumann neighborhood.at n=14A279999
• Integers which can be written in exactly three ways as sum of two distinct nonzero pentagonal numbers.at n=26A333013