54475

Appears in sequences

• Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AET = AlPO4-8 [Al36P36O144] starting with a T3 atom.at n=6A018949
• Numbers n such that n, n+1, n+2 are all of the form p*q^2 for distinct primes p,q.at n=8A178032
• Numerator of the frequency of the n-th dropping time in the Collatz iteration.at n=16A186107
• a(n) = Sum_{k=0..[n/2]} binomial((n-k)*k, k^2).at n=9A228833
• Starts of runs of 3 consecutive numbers that have an equal number of even and odd exponents in their prime factorization (A187039).at n=18A348077
• Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097).at n=37A348099