83339

Properties

Appears in sequences

• Wagstaff numbers: numbers k such that (2^k + 1)/3 is prime.at n=30A000978
• Numbers k such that 2^k + 1 has just two distinct prime factors.at n=50A066263
• Numbers k such that 2^k + 1 is the product of two distinct primes.at n=48A073936
• Numbers k such that 2^k + 1 is a semiprime.at n=49A092559
• Indices of prime Jacobsthal numbers.at n=31A107036
• Primes such that the outer 2 digits are n and n+1 and all inner digits are 3, where 0 < n < 9.at n=6A108820
• Primes arising as the 10's complement of A109862(n).at n=16A109863
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.at n=12A147118
• Primes of the form 9n^3-10.at n=5A201035
• Numbers n such that (2^n+1)/3 is prime, but cannot be written in the form a^2 + 3*b^2.at n=15A216551
• Numbers k such that (2^k + 1)/(2 - (-1)^k) is a prime.at n=35A280083
• Wagstaff numbers that are of the form 4*k + 3.at n=19A361562
• Primes having only {3, 8, 9} as digits.at n=33A385792
• Prime numbersat n=8135