54870

Appears in sequences

• Numbers k such that 263*2^k-1 is prime.at n=18A050890
• a(n) = Sum_{k=1..prime(n)-1} floor(k^3/prime(n)).at n=17A078837
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives z numbers.at n=7A125492
• Principal diagonal of the convolution array A213819.at n=29A213820
• Number of compositions of n with exactly 3 transitions between different parts.at n=20A244715