31224

Appears in sequences

• Coordination sequence for 4-dimensional I-centered tetragonal orthogonal lattice.at n=18A001386
• Expansion of (1+x)(1+x^2)/(1-x-x^3).at n=26A003410
• Expansion of Product_{m>=1} (1+x^m)^3.at n=22A022568
• Expansion of (1 - x^2)/(1 - x - x^3).at n=30A058278
• Expansion of (1-x)/(1-x-2*x^2-x^3).at n=15A078007
• a(n) = Sum_{k=0..n} C(n-k, floor(k/2)).at n=27A097333
• Sum of n and partition number of n.at n=39A133041
• Numbers a(n) for which there exists k>1 such that the number of partitions of a(n) into k parts is k.at n=38A209122
• Positions of the positive integers in the ordering of rational numbers as generated by the rules: 1 is in S, and if nonzero x is in S, then x+1 and -1/x are in S. (See Comments.)at n=25A226136
• Positions of the integers in the ordering of rational numbers as generated by the rules: 1 is in S, and if nonzero x is in S, then x+1 and -1/x are in S. (See Comments.)at n=34A226137
• Number of new rationals produced at the n-th iteration by applying the map t -> {t+1, -1/t} to nonzero terms, starting with S[0] = {1}.at n=27A226275
• Number of (17,11)-reverse multiples with n digits.at n=62A226916
• The number of base-2 Euler-Jacobi pseudoprimes (A047713) less than 2^n.at n=37A329237