87121

Properties

Appears in sequences

• Primes of the form n^2*totient(n)+1 (or A053191(n) + 1).at n=21A076669
• Primes of the form k^3 + k^2 + 1.at n=14A120479
• Primes of the form 5k^2 + 1.at n=7A137530
• Prime numbers p such that p +- ((p-1)/8) are primes.at n=28A137771
• Crystal ball sequence for the A2 x A2 lattice.at n=15A143008
• a(n) = 80*n^2 + 1.at n=33A158776
• Prime numbersat n=8461