22898

Appears in sequences

• Numbers that are not squarefree and whose Euler totient function is squarefree.at n=30A049198
• Numbers k such that sigma(k)*phi(k) is squarefree.at n=18A065299
• a(n) is the number of terms in the sum in A075405 (or 0 if no such square exists).at n=10A075406
• Numbers k such that the k-th difference between 2 successive primes equals the squarefree part of k.at n=33A078691
• a(n) = 2*prime(n)^2.at n=27A079704
• Number of partitions of n into parts with at most one 1 and at most one 2.at n=48A121081
• 2*p^2, for p an odd prime.at n=26A143928
• Irregular triangle in which row n has the values of k>1 such that sum_{i=n..n+k-1} i^2 is a square.at n=11A184885
• Composite numbers k such that Sum_{i=1..t-1} d(i+1)/d(i) is prime, where d(1), ..., d(t) are the divisors of k in ascending order.at n=27A255585
• a(n) is the smallest composite k such that d(2)/d(1) + d(3)/d(2) + ... + d(q)/d(q-1) = prime(n), where d(1) < d(2) < ... < d(q) are the q divisors of k, or 0 if no such k exists.at n=29A260901
• Total number of inversions in all partitions of n into distinct parts.at n=45A271371
• Where records occur in A070138.at n=28A298942
• Numbers k such that sopfr(k) = tau(k)^3.at n=11A305349
• Numbers k such that phi(k) == 2 (mod 12), where phi is the Euler totient function (A000010).at n=18A332511
• Numbers of the form 2*p^e, with p an odd prime and e >= 2.at n=41A354929
• Number of chiral pairs of polyominoes with n cubical cells of the regular tiling with Schläfli symbol {4,3,4}.at n=8A371397
• Record high values of A379248.at n=59A379294