23559

Appears in sequences

• a(n) is the least index such that the least primitive root of the a(n)-th prime is n, or zero if no such prime exists.at n=32A066529
• Triangle read by rows: TR(m,n) is the Wiener index of the hexagonal trapezium T(m,n), defined in the He et al. reference (1 <= n <= m).at n=32A248095
• Number of squares in the interval [e^(n-1), e^n).at n=22A306486
• Number T(n,k) of labeled cyclic chord diagrams with n chords such that every chord has length at least k; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=41A324428
• Number of labeled cyclic chord diagrams with n chords such that every chord has length at least six.at n=9A324432
• Number of weakly transitive ordered rooted trees with n nodes.at n=13A358454