18238

Appears in sequences

• Convolution of natural numbers >= 2 and natural numbers >= 3.at n=43A023545
• a(n) = T(n,0) + T(n,1) + ... + T(n,n), T given by A027157.at n=10A027164
• Start of a record-breaking run of consecutive composite integers with an odd number of prime factors.at n=6A066963
• Numbers n of the form k + reverse(k) for exactly three k.at n=37A071914
• Diagonal of array A085205.at n=16A085228
• a(n) = (1/3)*n^3 - n^2 - (1/3)*n - 1.at n=39A109620
• Numbers k such that k, k + 1 and k + 2 are 3 consecutive Harshad numbers.at n=42A154701
• Triangle of coefficients of polynomials v(n,x) jointly generated with A208751; see the Formula section.at n=59A208752
• Smallest positive integer m such that m, m+1, m+2, m+3 are divisible by 2n+1, 2n+3, 2n+5, 2n+7 respectively.at n=5A279259
• Numbers n such that phi(n) = Sum_{j=1..k} d(n^j) for some k, where phi(n) is the Euler totient function of n and d(n) is the number of divisors of n.at n=42A283757
• Number of time intervals that can be measured off with n ropes and a lighter.at n=11A287012
• Expansion of 1/(1 - Sum_{k>=1} k*x^k/(1 + x^k)).at n=12A320651