2156564410

Appears in sequences

• Denominator of Sum_{k=1..n} mu(k)/k.at n=29A070889
• Denominator of Sum_{k=1..n} mu(k)/k when it changes sign.at n=10A070891
• a(n) = product[k=0..n] P(k), where P(k) is the smallest prime > 3*n. a(n) = product[k=0..n] A118751(k).at n=8A118752
• Denominators of partial sums of (p+q)/p*q, where p and q are primes.at n=20A120832
• a(n) = product of the first n primes which are coprime to n.at n=8A125903
• a(n) is the smallest number such that the sum of the n-th powers of its distinct prime divisors is divisible by n.at n=17A199583
• a(n) is the smallest number such that the sum of the n-th powers of its distinct prime divisors is divisible by n.at n=23A199583
• a(n) is the smallest number such that the sum of the n-th powers of its distinct prime divisors is divisible by n.at n=35A199583
• a(n) = Product_{d|n, d<n} prime(1+A001414(d)), where A001414(d) gives the sum of prime factors of d, with repetition.at n=47A319692
• Records in A110765.at n=20A342125
• Let b be a composite number, c be the smallest composite number greater than b and coprime to b, and d = c-b. This sequence contains all b such that d is neither a prime nor a square.at n=24A353203
• Denominators of the partial alternating sums of the reciprocals of the squarefree kernel function (A007947).at n=29A379370
• Denominators of the partial alternating sums of the reciprocals of the powerfree part function (A055231).at n=28A379582
• a(n) = denominator of rational number Im(P(x))/Pi, x in interval (1/A005117(n+1),1/A005117(n)), where P(x) is the prime zeta function.at n=18A385944