28647

Appears in sequences

• a(1) = 3, a(n + 1) = 1 + a(n) + least odd prime factor of a(n).at n=30A144751
• Numbers k such that k and k+1 are both of the form p*q^3 where p and q are distinct primes.at n=26A215173
• Numbers whose arithmetic derivatives are a permutation of their digits.at n=35A225902
• G.f.: Product_{k>=1} (1 + 2*x^(k^2)) / (1-x^k).at n=29A280224
• a(n) = number of isogeny classes of abelian surfaces over the finite field of order prime(n).at n=43A362198