51282

Appears in sequences

• Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=28A080395
• Smallest k such that concatenation of r*k and 1 is a prime for all r = 1 to n, or smallest k such that 10*r*k +1 is a prime for all r = 1 to n.at n=6A089323
• Smallest k such that concatenation of r*k and 1 is a prime for all r = 1 to n, or smallest k such that 10*r*k +1 is a prime for all r = 1 to n.at n=7A089323
• Non-palindromic numbers n such that phi(n) = phi(reversal(n)).at n=30A097647
• Smallest k such that concatenation of r*k and 1 is a prime for all r = 1 to n but not prime for r = n+1, or smallest k such that 10*r*k+1 is a prime for all r = 1 to n but not prime for r = n+1.at n=7A100986
• a(n) = (n + 1!)*(n^2 + 2!)*(n^3 + 3!)/3!.at n=8A131682
• Number of 0..n arrays of length 7 with each element differing from at least one neighbor by 1 or less, starting with 0.at n=18A221686
• Number of partitions of n such that the number of parts having multiplicity >1 is a part and the number of distinct parts is a part.at n=50A241409
• Smallest member of bi-unitary sociable quadruples.at n=6A319915
• a(n-5) is the number of nonempty subsets of {1,2,...,n} such that the difference of successive elements is at least 5.at n=32A330910