73813

Appears in sequences

• a(n) = n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=3.at n=8A088581
• Wavelength (in ångströms) of the series limit of the Hydrogen spectrum for main quantum number n.at n=8A145646
• Number of n X 4 1..2 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nondecreasing order.at n=33A166805
• Number of nonempty subsets of {1, 2, ..., n} with <=9 pairwise coprime elements.at n=32A187270
• Numbers n such that n + sopf(n) + rad(n) = m and m - sopf(m) - rad(m) = n, where sopf(n) is the sum of the distinct primes dividing n and rad(n) is the squarefree kernel of n.at n=7A279935
• After the initial 1, numbers k such that A347381 obtains its minimum value at k, of all the divisors d of k larger than one, where A347381 is the distance from n to the nearest common ancestor of n and sigma(n) in the Doudna-tree (A005940).at n=32A374218
• Composite numbers k such that A347381 obtains the same value for all divisors of k that are larger than one, where A347381 is the distance from n to the nearest common ancestor of n and sigma(n) in the Doudna-tree (A005940).at n=12A374219