823544
domain: N
Appears in sequences
- Numbers that are the sum of 2 positive 7th powers.at n=21A003369
- Numbers that are the sum of at most 2 positive 7th powers.at n=29A004864
- a(n) = sigma_7(n), the sum of the 7th powers of the divisors of n.at n=6A013955
- Sierpiński numbers of the first kind: n^n + 1.at n=7A014566
- Numerator of sum of -7th powers of divisors of n.at n=6A017677
- a(n) = sigma_n(n): sum of n-th powers of divisors of n.at n=6A023887
- a(n) = 7^n + 1.at n=7A034491
- Sum of seventh powers of unitary divisors.at n=6A034681
- Sums of 2 distinct powers of 7.at n=21A038481
- If decimal expansion of n is ab...d, a(n) = a^a + b^b +...+ d^d.at n=17A045503
- If decimal expansion of n is ab...d, a(n) = a^a + b^b + ... + d^d (ignoring any 0's).at n=17A045512
- Numbers whose cube is palindromic in base 7.at n=21A046237
- Sums of two powers of 7.at n=28A055258
- (Product k^k) * (Sum 1/k^k) where both the sum and product are over those positive integers k that divide n.at n=6A057642
- Inverse Moebius transform of f(n) = n^n (A000312).at n=6A062796
- Numbers of the form a^a + b^b, a >= b > 0.at n=21A066846
- Numbers of the form (7^{mr}-1)/(7^r-1) for positive integers m, r.at n=15A076286
- a(n) = sigma_7(2n-1).at n=3A081865
- Numbers of the form (2n+1)^(2n+1) + 1.at n=3A085602
- Numbers that can be represented as a^7 + b^7, with 0 < a < b, in exactly one way.at n=15A088719