86784

Appears in sequences

• a(0)=1; a(n) = sigma_1(n) + sigma_3(n).at n=42A092345
• Expansion of ((1-x)/(1-2*x))^6.at n=9A169793
• Let x(0)x(1)... x(q-1)x(q) denote the decimal expansion of a number n. The sequence lists the numbers such that n and the number represented by its middle digits x(1)x(2)...x(q-1) have the same distinct prime divisors.at n=33A243812
• Triangle read by rows: T(n,k) = number of Ringel ladders of order n and genus k.at n=29A298800
• Numbers k such that 325*2^k+1 is prime.at n=19A322955