21207

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFI = ZSM-5 Nan[AlnSi96-nO192] starting with a T3 atom.at n=13A019160
• Dirichlet convolution of primes (with 1) with Bell numbers.at n=9A034758
• a(n) is the smallest number such that a(n)*n is an anagram of a(n)*5.at n=28A175694
• Composite Flavius' numbers (A000960) whose divisors are again Flavius' numbers.at n=6A181488
• Composite Flavius' numbers (A000960) whose prime factors are again Flavius' numbers.at n=14A181489
• Number of nX5 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.at n=10A298291