39826

Appears in sequences

• Numbers k such that 195*2^k+1 is prime.at n=31A032474
• Starting positions of strings of three 4's in the decimal expansion of Pi.at n=30A083615
• Consider any concatenation of the type n = concat(a,b). Sequence lists numbers that are the sum of the products of some of such couples a and b.at n=38A265737
• a(n) = 2*a(n-1) + a(n-3), where a(0) = 3, a(1) = 1, a(2) = 2.at n=14A332491
• a(n) = Sum_{k=1..n-1} tau(k) * sigma_2(n-k).at n=32A374973