22407

Appears in sequences

• Expansion of 1/((1-x)(1-5x)(1-6x)(1-7x)).at n=4A022033
• Number of base-2 strong pseudoprimes (A001262) less than 10^n.at n=11A055552
• Smallest k not a palindrome and not divisible by 10 such that k and R(k) (A004086) both are divisible by the n-th prime.at n=24A075605
• a(1) = a(2) = 1, a(n) = A007947(a(n-1)) + a(n-2), for n >= 3, i.e., a(n) = a(n-2) plus the largest squarefree divisor of a(n-1).at n=27A121368
• 7 times octagonal numbers: a(n) = 7*n*(3*n-2).at n=33A153797
• Triangle read by rows: T(n,k) is the number of weighted lattice paths B(n) having a total of k uhd and uHd strings.at n=37A247294
• Triangle read by rows: T(n,k) = number of partitions of genus 2 of n elements with k parts (n >= 6, 2 <= k <= n-4).at n=27A297178
• a(n) = Sum_{k=1..n} floor(n/k)^4.at n=11A318743
• Irregular triangle read by rows: the right-hand side of the triangle in A349813.at n=71A349814
• Central column (ignoring the zeros) of A349813, or leading entries in rows of A349814.at n=10A349819
• Triangle read by rows: T(n,k) = Stirling2(n+1,k)/binomial(k+1,2) if n-k is even, else 0 (1 <= k <= n).at n=61A363041
• Exponents k where A000120(3^k) - A070939(3^k)/2 reaches a new minimum.at n=38A372097