474045

Appears in sequences

• Indices n of primes p(n), p(n+3) such that p(n)+1 and p(n+3)+1 have the same largest prime factor.at n=19A105406
• G.f. A(x) satisfies A(x) = 1 + x*A(-x)^5.at n=8A143048
• Least odd primitive abundant number having its prime signature.at n=26A316116
• Subsequence of A071395. The extra constraint is m is not a term if m*q/p is abundant where prime p|m and q is the least prime larger than p.at n=26A333967
• Primitive abundant numbers for which there is no smaller primitive abundant number having the same ordered prime signature.at n=40A357921
• a(n) is the least number k such that there is a set of n proper divisors of k whose sum is k, and no set of fewer than n proper divisors of k whose sum is k.at n=32A389712