144690

Appears in sequences

• Coefficient of x^4 in (1-x-x^2)^(-n).at n=38A006504
• Product of the distinct primes dividing the product of composite numbers between consecutive primes.at n=26A076978
• Product of all distinct prime factors of all composite numbers between n-th prime and next prime.at n=25A079615
• Numbers n such that the denominator of the 2n-th Bernoulli number is divisible by n but sum_{d|n} sigma(d)/phi(d) is not an integer.at n=34A099008
• Numbers k such that usigma(k) >= 3*k, where usigma(k) = sum of unitary divisors of k (A034448).at n=26A285615
• a(n) = n*(2*n + 1)*(4*n + 1).at n=26A316224
• Products of 6 distinct primes that are sandwiched between semiprime numbers.at n=13A378627
• Squarefree 3-abundant numbers: squarefree numbers k such that A000203(k) > 3*k.at n=26A387153