70531

Appears in sequences

• n-th 4k+1 prime times (n+1)st 4k+3 prime.at n=27A048628
• a(0)=0, a(1)=1, a(n) = min{3 a(k) + (3^(n-k)-1)/2, k=0..(n-1)} for n>=2.at n=43A259653
• Nonprime squarefree numbers whose prime indices all have the same Omega (A001222) and the same sum of prime indices (A056239).at n=31A327908