66585

Appears in sequences

• Triangle read by rows: T(n,k) is the number of ordered trees having n edges and k branches of length 2.at n=42A101307
• Pell companion numbers A001333 without last digit.at n=12A131607
• Expansion of 1/(1-x*sqrt(1+4*x^2)).at n=23A190864
• Sum of prime divisors of n (with repetition) is one less than the sum of prime divisors (with repetition) of n+1.at n=41A228126
• Numbers n such that (i) the sum of prime divisors of n (with repetition) is one less than the sum of prime divisors (with repetition) of n+1, and (ii) n and n+1 have the same number of prime divisors (with repetition).at n=13A237929
• a(n) = a(n-1) + a(n-2) + 2*a(floor(n/2)) + 3*a(floor(n/3)) + ... + n*a(floor(n/n)), where a(0) = 1, a(1) = 1, a(2) = 1.at n=18A298369
• Numbers k such that A001414(k+1) = A001414(k)+1 and A001414(k)^2+3*A001414(k)+1 is prime.at n=17A352581