20515

Appears in sequences

• Sum of 6th powers: 0^6 + 1^6 + 2^6 + ... + n^6.at n=5A000540
• a(n) = 1^n + 2^n + ... + 5^n.at n=6A001552
• Denominator of L(n) = (Sum_{k=1..n} k^n)/(Sum_{k=1..n-1} k^n).at n=4A043300
• Numbers n such that n!! - 2 is prime.at n=19A094144
• a(n) = Sum_{k=1..n-1} k^n.at n=5A121706
• Triangle T(n,m) read by rows: T(n,0)=T(n,n)=1, else T(n,m) = binomial(n,m) + 2^(2*n-3)*binomial(n-2,m-1).at n=31A173152
• Triangle T(n,m) read by rows: T(n,0)=T(n,n)=1, else T(n,m) = binomial(n,m) + 2^(2*n-3)*binomial(n-2,m-1).at n=32A173152
• Sum of distinct nonzero sixth powers.at n=30A194769
• Least k such that k*6^n-1 , k*6^n+1, and 2*k*6^n-1 are prime; that is, twin primes and a Sophie Germain prime.at n=24A212481
• Triangle T(n,k) = sum of the k first n-th powers.at n=26A215083
• Numbers which are the sums of consecutive sixth powers.at n=15A217846
• Total number of smallest parts that are also emergent parts in all partitions of n.at n=42A220479
• Total number of smallest parts that are also emergent parts in all partitions of n with at least one distinct part: a(n) = n + d(n) + p(n-1) + spt(n) - A000070(n) - sigma(n) - 1.at n=42A220483
• Numbers with 3 prime factors a < b < c such that 2c = a^4 + b^2.at n=3A261657
• G.f. = b(2)*b(4)*b(6)/(x^8-x^3-x+1), where b(k) = (1-x^k)/(1-x).at n=22A266338
• Array read by ascending antidiagonals: A(n, k) = HurwitzZeta(-n, k) - HurwitzZeta(-n, k+n) with k >= 0.at n=21A391310