55456

Appears in sequences

• Numbers k such that 2^k + 3 is prime.at n=43A057732
• Permanent of the n X n matrix with numbers 1,2,...,n^2 in order across rows.at n=4A232773
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 537", based on the 5-celled von Neumann neighborhood.at n=38A272792
• Infinite sum of the natural numbers, compacted (see comments for an explanation).at n=18A336897