205339

Properties

Appears in sequences

• Expansion of 1/((1-3*x)*(1-7*x)).at n=6A016138
• Zsigmondy numbers for a = 7, b = 3: Zs(n, 7, 3) is the greatest divisor of 7^n - 3^n that is relatively prime to 7^m - 3^m for all positive integers m < n.at n=6A109348
• Primes of the form (7^n - 3^n)/4.at n=1A138917
• a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^7, where Lucas(n) = A000204(n).at n=3A203858
• Triangle read by rows, S_4(n, k) where S_m(n, k) are the Stirling-Frobenius subset numbers of order m; n >= 0, k >= 0.at n=29A225469
• Primes which are sums of a prime triple (p, p+4, p+6).at n=36A377406
• Prime numbersat n=18410