19242

Appears in sequences

• Number of series-reduced planted trees with n+9 nodes and 4 internal nodes.at n=34A001860
• Index of the first occurrence of A019565(2n-1) in sequence A103790.at n=26A103791
• a(1) = a(2) = 1; for n>2, a(n+1) = a(n) + a(n-1) iff n is prime, otherwise a(n+1) = a(n) + 1.at n=46A113050
• Half-indexed Lucas numbers a(n)=round(sqrt((1+sqrt(5))/2)^n) a(2n)=L(n)=A000032, so a(n)=L(n/2).at n=40A127207
• a(n) = floor( prime(n)^3 / (n*log(n)) ).at n=29A259648
• Expansion of Product_{k>=0} 1/(1-x^(3*k+1))^3.at n=26A261631
• Number of ways to write n as an ordered sum of 6 primes (counting 1 as a prime).at n=38A341985