24690

Appears in sequences

• Number of partitions of n into parts not of the form 21k, 21k+5 or 21k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=40A035983
• Convolution of sequence of primes with sequence sigma(n).at n=29A086718
• Partial sums of repdigits of A002276.at n=4A099669
• Number of terms with n digits in A154780.at n=21A154779
• a(n) gives the number of nonisomorphic connected compact Lie groups of dimension n which are simple products.at n=57A177821
• Position of 3^n in A051037 (5-smooth numbers).at n=50A188426
• a(n) = n*(16*n^2 - 21*n + 7)/2.at n=15A260260
• Numbers obtained by adding the first k repdigits that consist of the same digit, for some number k.at n=37A346535
• Number of integer partitions of n such that (length) <= 2*(median).at n=47A362048
• a(n) = Sum_{k=0..n} (2*k+1) * (-1/2)^(n+k) * (2*k)! * (n-k)! * binomial(n,k)^2.at n=5A383282