1525878906

Appears in sequences

• a(n) = (5^n - 1)/4.at n=14A003463
• a(n) = Sum_{j=0..13} n^j.at n=5A104376
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 15.at n=4A161025
• Expansion of x*(1+5*x-5*x^3)/(1-6*x^2+5*x^4).at n=26A249222
• a(n) = (5^(2*(n + 1)) - 1)/4.at n=5A275766
• Oblong numbers m such that beta(m) = tau(m)/2 where beta(m) is the number of Brazilian representations of m and tau(m) is the number of divisors of m.at n=16A326385