77597520

Appears in sequences

• a(n) = denominator of harmonic number H(n) = Sum_{i=1..n} 1/i.at n=18A002805
• Denominator of Sum_{k=1..n} d(k)/k, where d() = A000005().at n=18A065080
• Denominator of Sum_{k=1..n} d(k)/k, where d() = A000005().at n=19A065080
• Numbers k which, for some r, are r-digit maximizers of k/phi(k).at n=23A065800
• Denominators of Sum_{k=1..n} 1/lcm(n,k).at n=18A074949
• a(n) is the lcm of related numbers to n (counted in A073757): related = {divisor-set, RRS}.at n=20A083268
• Denominator of b(n), where Sum_{k>=1} b(k)/k^r = 1/(Sum_{k>=1} H(k)/k^r). H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.at n=18A097504
• Denominator of Sum_{i=1..n} 1/(i*C(2*i,i)).at n=11A112100
• a(n) is the denominator of the sum of the reciprocals of the positive integers k, k<=n, where every positive integer <= k and coprime to k is also coprime to n.at n=18A126262
• a(n) = denominator of sum{k=1 to n} 1/A127518(k).at n=18A127520
• Noncrossing set partition version of A102356.at n=19A130760
• Numbers with exactly 8 distinct prime divisors {2,3,5,7,11,13,17,19}.at n=7A147575
• a(n) = n!*(floor(n/30))!/((floor(n/2))!*(floor(n/3))!*(floor(n/5))!).at n=19A211418
• Define a sequence of rationals by f(0)=0, thereafter f(n)=f(n-1)-1/n if that is >= 0, otherwise f(n)=f(n-1)+1/n; a(n) = denominator of f(n).at n=19A231693
• Define a sequence of rationals by f(0)=0, thereafter f(n)=f(n-1)-1/n if that is >= 0, otherwise f(n)=f(n-1)+1/n; a(n) = denominator of f(n).at n=20A231693
• First bisection of harmonic numbers (denominators).at n=9A232181
• Numerator of the harmonic mean of the first n primes.at n=7A250130
• Numbers n such that the multiplicative group modulo n is the direct product of 9 cyclic groups.at n=9A272599
• Denominator of sum of reciprocals of numbers less than n that do not divide n.at n=19A281086
• Positive integers where the number of triples of divisors (d1, d2, d3) such that d1 < d2 < d3 < 2*d1 and each pair of these divisors is pairwise coprime, sets a new record.at n=34A333966