2993760

Appears in sequences

• Nonuple factorial, 9-factorial, n!9, n!!!!!!!!!.at n=42A114806
• a(n) = Product_{k = 1..n-1} (9*k - 3).at n=5A147630
• T(n,k) is the n-th derivative of the difference between the k-th tetration of x (power tower of order k) and its predecessor (or 0 if k=0) at x=1; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=52A277536
• Triangle T(n, k) read by rows: row n gives the coefficients of the numerator polynomials of the o.g.f. of the (n+1)-th diagonal of the Sheffer triangle A282629 (S2[3,1] generalized Stirling2), for n >= 0.at n=20A290316
• Bi-unitary highly composite numbers: where the number of bi-unitary divisors of n (A286324) increases to a record.at n=15A293185
• Table T(n,k) read by upward antidiagonals. T(n,k) = Product_{i=1..n} Sum_{j=1..k} (i-1)*k+j.at n=23A333445
• Nonexponential superabundant numbers: numbers m such that nesigma(m)/m > nesigma(k)/k for all k < m, where nesigma(m) is the sum of nonexponential divisors of m (A160135).at n=16A348630