73513440

Appears in sequences

• a(1)=1; for n > 1, a(n) is the smallest number with the same number of divisors as 2*a(n-1).at n=30A019505
• Triangle read by rows. A generalization of unsigned Lah numbers, called L[4,1].at n=50A048854
• Smallest n-digit number with A066150(n) divisors.at n=7A066151
• LCM of numbers <= n and having a factor in common with n.at n=35A066574
• LCM of numbers m such that 1 <= m <= n, m has a common factor with n, but m does not divide n.at n=35A066575
• Least k such that n*prime(k) <= k*tau(k).at n=35A073066
• Least number k such that the number of divisors of k which are < log(k) equals n.at n=18A096001
• Numerator of the harmonic mean of the first n positive integers.at n=17A102928
• a(1) = 1; for all n >= 2, we choose a(n) to be as small as possible so that for all i = 1, ..., n, the sequence of the i-th divisors of a(1), a(2), ..., a(n) is nonincreasing.at n=33A136339
• a(n) is the smallest number with same number of divisors as n*a(n-1).at n=11A138113
• Highly composite numbers (A002182) whose following highly composite number is at least 3/2 times greater.at n=23A162936
• Numbers n such that both n and n/2 are highly composite (A002182).at n=33A181809
• Superabundant numbers (A004394) that are not colossally abundant (A004490).at n=28A189228
• Where records occur in A129308 and also in A195155.at n=28A195307
• Numbers n such that there are four distinct triples (k, k+n, k+2n) of squares.at n=10A222155
• Table (read by rows) of all k-digit positive integers (in ascending order) with maximum number of divisors A066150(k).at n=18A240544
• Denominators of constants A(a) related to the asymptotic LCM of arithmetic progressions a*n+b (a and b coprime).at n=18A249226
• Numbers n such that Sum_{d|n} 1/sigma(d) > Sum_{d|m} 1/sigma(d) for all m < n.at n=46A266228
• Numbers k such that there exist exactly five distinct Pythagorean triangles, at least one of them primitive, with area k.at n=1A291591
• Bi-unitary superabundant numbers: numbers n such that bsigma(n)/n > bsigma(m)/m for all m < n, where bsigma is the sum of the bi-unitary divisors function (A188999).at n=17A292984