42798

Appears in sequences

• a(1)=1; for n>1, a(n) = 8*a(n-1) + n.at n=5A014831
• Take the first n numbers written in base 8, concatenate them, then convert from base 8 to base 10.at n=5A048440
• The first n digits of the juxtaposition of the base-8 numbers converted to decimal.at n=5A055149
• Least k such that the difference between consecutive 3-almost primes A014612(k) equals n, or 0 if no such k exists.at n=26A131939
• Triangle T(n,k) read by rows: T(n,k) = (n-k+1)*T(n-1,k-1) + (3*k-2)*k*T(n-1,k), initialized by T(n,1) = T(n,n) = 1.at n=22A166972
• a(n) = A002704(n)-2.at n=3A262583
• a(n) = Sum_{d|n} sigma_3(d).at n=31A321140
• Expansion of 1/sqrt((1-7*x)^3 * (1+x)).at n=5A383944