24969
domain: N
Appears in sequences
- Odd integers m such that phi(m) | sigma(m).at n=15A015715
- Numbers n such that sigma(n)/phi(n) is prime.at n=35A067780
- Numbers n such that sigma(n) = 3*phi(n).at n=7A068391
- Numbers n such that sigma(n) = phi(3n).at n=9A074891
- Numbers k such that both k and 2*k are balanced numbers (A020492).at n=24A076375
- Squarefree balanced numbers (i.e., squarefree members of A020492).at n=39A078557
- Records in A111229.at n=36A111270
- Numbers such that Sigma(m)*UnitarySigma(m)= k*UnitaryPhi(m)^2, for some integer k.at n=45A122839
- Table of Encoded Bell Multisets using A064553 (cf. A129305).at n=29A130274
- Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 2 array.at n=28A219680
- G.f. = b(4)*b(6)/(x^8+x^6-x^5-x^3+x^2-2*x+1), where b(k) = (1-x^k)/(1-x).at n=15A266371
- Squarefree numbers k such that alpha(k) = lambda(k), where alpha(k) = LCM of all (p+1) for primes p dividing k, and lambda(k) = A002322(k).at n=7A287514
- Numbers k such that k and k+1 are the product of exactly four distinct primes.at n=24A318896