73561

Properties

Appears in sequences

• a(n) = Sum_{m=1..n} T(m,n+1-m), array T as in A048887.at n=19A048888
• Product of the square matrix in A065941 and the column vector (1, 2, 3, ...)'.at n=18A131913
• Number of increasing sequences of n integers x(1),...,x(n) with values in 1..3*n such that x(j) divides x(k) if j divides k.at n=18A180385
• Primes p such that p - ssd(p) is the square of a prime, where ssd(k) is the sum of the squared decimal digits of k.at n=9A227785
• Total sum T(n,k) of the sizes of all blocks with maximal element k in all set partitions of {1,2,...,n}; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=49A270701
• Total sum T(n,k) of the sizes of all blocks with minimal element k in all set partitions of {1,2,...,n}; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=50A270702
• Total sum of the sizes of all blocks with maximal element 5 in all set partitions of {1,2,...,n}.at n=5A270759
• Total sum of the sizes of all blocks with minimal element 6 in all set partitions of {1,2,...,n}.at n=4A270769
• Primes in A354975.at n=14A355009
• Prime numbersat n=7263