20615
domain: N
Appears in sequences
- Stirling numbers of the first kind: s(n+2, n).at n=19A000914
- Number of zeros in character table of symmetric group S_n.at n=15A006907
- Smallest order of cyclotomic polynomial containing n or -n as a coefficient.at n=25A013594
- Smallest order of cyclotomic polynomial containing n or -n as a coefficient.at n=26A013594
- Odd numbers to the right of the central elements of the (2,3)-Pascal triangle A029600.at n=53A029616
- Odd numbers to left of central elements of the (3,2)-Pascal triangle A029618.at n=54A029630
- Numbers n such that the cyclotomic polynomial of order n has a nonzero coefficient which does not appear in any cyclotomic polynomials of lower order.at n=16A046887
- Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n is neither a prime, nor a true power of prime and n is squarefree. Squarefree solutions of A071140.at n=21A071141
- Numbers n such that (i) the sum of the distinct primes dividing n is divisible by the largest prime dividing n and (ii) n has exactly 4 distinct prime factors and (iii) n is squarefree.at n=8A071143
- Squarefree numbers k such that the largest prime factor of k is equal to the sum of the other prime factors of k.at n=20A071312
- Sequence resulting from a sum of three repeated binomial(n+3,4) sequences.at n=37A093039
- Numbers n such that the middle coefficient of the cyclotomic polynomial Phi_n(x) has a value not obtained for any smaller n.at n=13A095877
- Smallest order of the cyclotomic polynomial whose maximal coefficient in absolute value is n.at n=26A136418
- Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) is not coefficient convex.at n=4A146960
- Indices of records in heights of cyclotomic polynomials (A160338).at n=11A160340
- Ordered Stirling numbers S1(n,k) >= 0.at n=26A193245
- Number of partitions p of n including round(mean(p)) as a part. (This is "Mathematica round").at n=40A241338
- a(n) = (n^2 - n + 1)*(n^2 + n - 1).at n=11A257925
- Least k such that the k-th cyclotomic polynomial has n as a coefficient.at n=24A262404
- Least k such that the k-th cyclotomic polynomial has n as a coefficient.at n=26A262404