27933

Appears in sequences

• Poincaré series [or Poincare series] of Lie algebra associated with a certain braid group.at n=16A007990
• Least number which becomes prime or 4 after exactly n iterations of f(x) = sum of prime factors of x.at n=11A048133
• Odd numbers in sorted order from generation 2 onwards.at n=35A048462
• Smallest k such that A002217(k)=n.at n=11A121360
• Starting with a(1) = 6, a(n) is the smallest number whose sum of prime divisors (taken with multiplicity) is a(n-1). In other words, a(n) = A056240(a(n-1)).at n=10A318387
• a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2*j*k) / phi(k).at n=34A372664
• a(n+1) is the smallest product of two or more primes which sum to a(n), starting from a(1) = 5.at n=11A386524