136649

Properties

Appears in sequences

• Let a(1)=1; for n>1, a(n)=nextprime((Pi/2)*a(n-1)).at n=23A084572
• a(n) = 6*b_6(n)+5, where b_6 lists the indices of zeros of the sequence A261306: u(n) = abs(u(n-1)-gcd(u(n-1),6*n-1)), u(1) = 1.at n=5A186258
• a(n) = (16/3)*(n+1)*n*(n-1) + 8*n^2 + 1.at n=28A212668
• G.f.: 1/(1 - (1*x)/(1 - (2*x)^2/(1 - (3*x)^3/(1 - (4*x)^4/(1 - (5*x)^5/(1 - ...)))))).at n=11A343420
• Number of Catalan words of length n avoiding the pattern 0000.at n=13A356697
• Prime numbersat n=12728