81191
domain: N
Appears in sequences
- Composite numbers whose prime factors contain no digits other than 1 and 6.at n=11A036306
- Gaps of 10 in sequence A038593 (upper terms).at n=28A038660
- Numbers n such that the sum of the prime factors of n equals the product of the digits of n.at n=38A067173
- The terms of A073211 (sums of two powers of 11) divided by 2.at n=18A073219
- Numerator of the product of the n-th triangular number and the n-th harmonic number.at n=9A119786
- Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)*(2*k+1)*(Sum_{i=1..k} 1/i).at n=9A120284
- Where records occur in A127356.at n=16A129315
- a(n) = n^3*(n^2 + 1)/2.at n=11A168178
- Denominator of H(n)/H(n-1), where H(n) is the n-th harmonic number = Sum_{k=1..n} 1/k.at n=9A193758
- Numerators of constants A(a) related to the asymptotic LCM of arithmetic progressions a*n+b (a and b coprime).at n=10A249225
- a(n) = A003418(n+1)*H(n), where H(n) = 1 + 1/2 + ... + 1/n is the n-th harmonic number.at n=9A379561