78126

Appears in sequences

• Numbers that are the sum of 2 positive 7th powers.at n=10A003369
• Numbers that are the sum of at most 2 positive 7th powers.at n=16A004864
• Numbers that are the sum of at most 3 positive 7th powers.at n=36A004865
• a(n) = sigma_7(n), the sum of the 7th powers of the divisors of n.at n=4A013955
• Numerator of sum of -7th powers of divisors of n.at n=4A017677
• Numbers k such that k^2 is palindromic in base 5.at n=25A029988
• a(n) = 5^n + 1.at n=7A034474
• Sum of seventh powers of unitary divisors.at n=4A034681
• Sums of two distinct powers of 5.at n=21A038474
• Numbers whose cube is palindromic in base 5.at n=8A046233
• Sums of two powers of 5.at n=28A055237
• Numbers of the form (5^{mr}-1)/(5^r-1) for positive integers m, r.at n=15A076284
• a(n) = sigma_7(2n-1).at n=2A081865
• Numbers that can be represented as a^7 + b^7, with 0 < a < b, in exactly one way.at n=6A088719
• Suppose n=(p1^e1)(p2^e2)... where p1,p2,... are the prime numbers and e1,e2,... are nonnegative integers. Then a(n) = e1 + (e2)*5 + (e3)*25 + (e4)*125 + ... + (ek)*(5^(k-1)) + ...at n=37A090882
• a(n) = Sum_{0<d|n, n/d odd} d^7.at n=4A096961
• Square array T(r,m) read by antidiagonals: number of cyclically reduced words of length m in F_r.at n=42A104000
• Sum of 7th powers of digits of n.at n=15A123253
• a(n) = smallest number that leads to a new cycle under the base-5 Kaprekar map of A165032.at n=7A165048
• Numbers of the form 5^j + 7^k, for j and k >= 0.at n=42A226818