36743

Appears in sequences

• Numbers k such that j(k)*phi(k) = sigma(phi(k)), j(k) = A033831(k).at n=17A033856
• Numbers having four 5's in base 9.at n=13A043476
• 30*a(n) is the gap between sexy prime triples in the n-th sexy prime triple triple whose initial term is 11.at n=19A090890
• Numbers n such that 6*p(n)-1 and 6*p(n)+1 are twin primes and 6*p(n+1)-1 and 6*p(n+1)+1 are also twin primes with p(n) = n-th prime.at n=37A126655
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p that are < p/2.at n=36A282724
• a(n+1) = Sum_{k=1..n} (a(k) + k*(n-k)), with a(1)=1.at n=13A335927