109230

Appears in sequences

• Squarefree numbers of the form (prime(k)+1)*(prime(k+1)+1)/4.at n=27A079095
• Numbers n such that the denominator of the 2n-th Bernoulli number is divisible by n but sum_{d|n} sigma(d)/phi(d) is not an integer.at n=30A099008
• Numbers n such that A003313(3n) < A003313(n).at n=22A104699
• Numbers k such that A003313(k) = A003313(6*k).at n=22A116461
• a(n) is the floor of the first component of M^n * (0, 1, 2, 3) where M is the matrix [[c, 1/2, 1/2, 1/2], [1/2, c, 1/2, 1/2], [1/2, 1/2, c, 1/2], [1/2, 1/2, 1/2, c]] and c=sqrt(3)/2.at n=13A121811
• a(n) = 5*(-1)^n*A078008(n).at n=16A156550
• p-INVERT of (1,0,0,1,0,0,0,0,0,...), where p(S) = (1 - S)^2.at n=28A292324
• Oblong numbers which are products of five distinct primes.at n=28A359304