21106

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 65.at n=23A020404
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 32.at n=1A031620
• Number of partitions of 2*n into minimal numbers.at n=44A099385
• G.f. A(x) satisfies A(x) = 1/(1 - x/(1 - x*A(x))^4).at n=7A321798
• a(n) = Sum_{k=1..n} floor(n^3/k^3).at n=25A344675
• Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1.at n=32A368702