20869

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFI = ZSM-5 Nan[AlnSi96-nO192] starting with a T2 atom.at n=13A019159
• Base-8 palindromes that start with 5.at n=24A043025
• a(n) = 15*n^2 + 9*n + 1.at n=37A134153
• Last term where no prime sums occur in A161190 in a 4-diagonal set of 24 terms.at n=10A161193
• Number of binary strings of length n with no substrings equal to 0001 1011 or 1100.at n=18A164489
• a(n) = Sum_{y=1..n} Sum_{x=1..n} floor((x^k + y^k)^(1/k)) with k = 2.at n=29A211791
• Shifts 10 places left under Euler transform with a(0)=0 and a(n)=1 for n<10.at n=39A218027
• Number of maximal irredundant sets in the n-Andrásfai graph.at n=13A291053
• Starts of runs of at least 3 consecutive odd numbers whose prime factors are all prime-indexed primes.at n=22A357168
• Denominators of the convergents given by treating A084580 as continued fraction coefficients after the leading 0.at n=14A390652
• Expansion of g^2/(1 + x^3*g^2), where g = 1+x*g^3 is the g.f. of A001764.at n=7A391298