23474

Appears in sequences

• Composite numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=39A046358
• a(n) = Sum_{i=0..n+1} binomial(2*n-i,n-i+1)*Catalan(i).at n=7A277871
• For any number n > 0, let f(n) be the function that associates k to the prime(k)-adic valuation of n (where prime(k) denotes the k-th prime); f establishes a bijection between the positive numbers and the arithmetic functions with nonnegative integer values and a finite number of nonzero values; let g be the inverse of f; a(n) = g(f(n) * f(n)) (where i * j denotes the Dirichlet convolution of i and j).at n=21A296857
• Number of integer partitions of n whose Heinz number (product of primes of parts) is divisible by their sum of primes of parts.at n=48A330953