86453

Properties

Appears in sequences

• Indices of prime repunits: numbers k such that 11...111 (with k 1's) = (10^k - 1)/9 is prime.at n=6A004023
• Primes equal to the sum of the first k primes for some k.at n=21A013918
• Records in A111267.at n=32A111268
• Numbers n such that (10^n-1)/9 is prime, but cannot be written in the form a^2 + 3*b^2.at n=4A216549
• Primes of the form k^2 + 17.at n=14A228244
• Primes p such that p+8, p+86, p+864 are prime.at n=39A236302
• Expansion of (eta(q^3)eta(q^6)/(eta(q)eta(q^2)))^4 in powers of q.at n=12A284607
• Prime numbersat n=8407