20584

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 19 ones.at n=17A031787
• Length of A001388(n).at n=33A046639
• Smallest integer >= 0 of the form x^3 - n^4.at n=29A070930
• Let f(k) = exp(Pi*sqrt(k)); sequence gives numbers k such that ceiling(f(k)) - f(k) < 1/10^3.at n=34A127022
• Expansion of (1/3) * (c(q)^2 / c(q^2)) / (b(q)^2 / b(q^2)) in powers of q where b(), c() are cubic AGM theta functions.at n=8A128639
• Expansion of phi(-q^9) / phi(-q) in powers of q where phi() is a Ramanujan theta function.at n=24A128770
• Least k with precisely n partitions k = x + y satisfying sigma(k) = sigma(x) + sigma(y).at n=18A211224
• Number of partitions of n that sorted in increasing order contain a part k in position k for some k.at n=37A238395
• Expansion of phi(q^9) / phi(q) in powers of q where phi() is a Ramanujan theta function.at n=24A261988
• Number of sets of exactly n positive integers <= n+7 having a square element sum.at n=19A281970
• Numbers of the form ab such that uphi(ab) = a*b where ab is the concatenation of a and b.at n=25A337523
• a(n) = Sum_{k=0..floor(n/3)} binomial(n,k)^2 * binomial(n-2*k,k).at n=9A383525