44460

Appears in sequences

• a(n) = (n-3)*A006918(n-2)/2 for n >= 2, with a(0) = a(1) = 0.at n=39A038376
• Numbers k such that phi(k) = 2*tau(k)^2.at n=30A068564
• Numbers in the cycle-attractors of length=14 of the function f(x)=A063919(x).at n=29A097030
• Numbers k such that 2*k-1, 4*k-1, 6*k-1 and 8*k-1 are primes.at n=25A124487
• Numbers with prime factorization pqrs^2t^2.at n=21A189989
• Numbers n such that A000203(2*n) divides 2*n*A045917(n).at n=21A245629
• Smallest number k such that k*(2^(2*A000043(n))-1)+1 is prime.at n=29A268175
• Numbers that are members of unitary sigma aliquot cycles (union of unitary perfect, unitary amicable and unitary sociable numbers).at n=48A327157
• Irregular triangle of cycles of purely periodic unitary sigma aliquot sequences with their smallest member as starting number, read by rows.at n=40A336216
• a(n) = n * (binomial(n,2) - 2).at n=45A341768
• Number of Frobenius partitions of 2*n that satisfy the condition that the sum of the entries on the top row plus the number of columns is less than or equal to the sum of the entries on the bottom row.at n=22A342208