21332

Appears in sequences

• Expansion of (1+x)/(1-x-x^2-x^4-x^5).at n=17A014743
• Number of partitions in parts not of the form 11k, 11k+3 or 11k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 4 are greater than 1.at n=45A035946
• Numbers k that divide Sum_{j=1..k} A051953(j) where A051953(j) = j - Phi(j). Arithmetic mean of first k cototient values is an integer.at n=10A063986
• Consider the mapping f(a/b) = (a^2 + b)/(a^2 - b). Taking a =2, b = 1 to start with and carrying out this mapping repeatedly on each new (reduced) rational number gives the following sequence 2/1,5/3,14/11,207/185,... Sequence contains the denominators.at n=4A081484
• a(n) is the nearest integer to sqrt(pi(10^n)) (see A006880).at n=10A221205
• Number of 1-separable partitions of n; see Comments.at n=48A239467
• Numbers m such that sigma(m) is a partition number.at n=23A252891
• Numbers that are the sum of seven fourth powers in six or more ways.at n=28A345572
• Numbers that are the sum of seven fourth powers in seven or more ways.at n=7A345573
• Numbers that are the sum of seven fourth powers in eight or more ways.at n=3A345574
• Numbers that are the sum of seven fourth powers in nine or more ways.at n=2A345575
• Numbers that are the sum of seven fourth powers in exactly nine ways.at n=2A345831
• Expansion of (1/x) * Series_Reversion( x * (1-x)^2 * (1-x+x^2) ).at n=6A368938