513890

Appears in sequences

• Numbers k such that phi(k, 2) = phi(k+1, 2), where phi(k, 2) = A002472(k).at n=26A301868
• 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=28A333967