40950

Appears in sequences

• Unitary harmonic numbers (those for which the unitary harmonic mean is an integer).at n=17A006086
• a(n) = 2*binomial(n,4).at n=28A034827
• Product of n with sum of next n consecutive integers.at n=29A036659
• a(n) = n^2*(n-1)*(n-2).at n=13A047929
• a(n) = (1/24)*n*(n + 5)*(n^2 + n + 6).at n=29A051743
• Coefficients of replicable function number "32b".at n=44A058632
• Infinitary harmonic numbers: harmonic mean of infinitary divisors is an integer.at n=15A063947
• a(n) = (2^(n-1)/(2n)!)*Product_{k=1..n} q(k) where q(n) is the denominator of B(2n), the 2n-th Bernoulli number.at n=11A069267
• (Sum of digits of n)^5 - (sum of digits^5 of n).at n=19A069965
• Reverse of largest prime factor of n = smallest prime factor of n+1; a(1)=1.at n=29A071393
• Largest n-digit number minus the product of its digits; i.e., a(n) = 99999... (n 9's) - 9^n.at n=3A083445
• Triangle read by rows: T(n,k) = (n+1,k)-th element of (M^8-M)/7, where M is the infinite lower Pascal's triangle matrix, 1<=k<=n.at n=32A096042
• Triangle read by rows: T(n,k) is the number of labeled 2-connected planar graphs with n nodes and k edges, n >= 3, n <= k <= 3(n-2).at n=23A100960
• Numbers that have exactly seven prime factors counted with multiplicity (A046308) whose digit reversal is different and also has 7 prime factors (with multiplicity).at n=27A109027
• Primitive elements of A096490.at n=24A118671
• Rectangular array read by antidiagonals: a(n, k) is the number of ways to put k labeled objects into n labeled boxes so that there are exactly two boxes with exactly one object (n, k >= 2).at n=49A131105
• Corresponding values of arithmetic means of divisors of numbers from A007340.at n=32A157848
• Triangle of Generalized Runyon numbers R_{n,k}^(3) read by rows.at n=39A173020
• Numbers with prime factorization pqrs^2t^2.at n=19A189989
• The number of ways of putting n labeled items into k labeled boxes so that each box receives at least 2 objects.at n=22A200091