31395

Appears in sequences

• Odd square pyramidal numbers.at n=22A015221
• Denominator of |Bernoulli(2n+2)| - |Bernoulli(2n)|.at n=11A029765
• Odd numbers with exactly 5 distinct prime factors.at n=6A046391
• Denominators of column 3 of table described in A051714/A051715.at n=22A051721
• a(n) = binomial(n+4,4)*(2*n+1).at n=11A051880
• For a rational number p/q let f(p/q) = p*q divided by the sum of digits of p and q; a(n) is obtained by iterating f, starting at n/1, until an integer is reached, or if no integer is ever reached then a(n) = 0.at n=6A059175
• Structured rhombic dodecahedral numbers (vertex structure 9).at n=22A100157
• Odd squarefree abundant numbers.at n=6A112643
• Odd infinitary abundant numbers.at n=20A127666
• Odd unitary abundant numbers.at n=6A129485
• a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.at n=21A131672
• a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.at n=22A131672
• a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.at n=23A131672
• a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.at n=24A131672
• a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.at n=25A131672
• 13 times hexagonal numbers: a(n) = 13*n*(2*n-1).at n=35A194713
• Expansion of 1 / (1 - 6*x + 20*x^3 - 15*x^4 + x^6).at n=6A200782
• T(n,k) is the number of arrays of n+2 elements from {0,1,...,k} with no two consecutive ascents.at n=31A200785
• Number of 0..n arrays x(0..5) of 6 elements without any two consecutive increases.at n=4A200788
• Number of blocks in a Steiner Quadruple System of order A047235(n+1).at n=29A228124