95369

Properties

Appears in sequences

• Wagstaff numbers: numbers k such that (2^k + 1)/3 is prime.at n=31A000978
• Numbers k such that 2^k + 1 has just two distinct prime factors.at n=51A066263
• Numbers k such that 2^k + 1 is the product of two distinct primes.at n=49A073936
• Numbers k such that 2^k + 1 is a semiprime.at n=50A092559
• Indices of prime Jacobsthal numbers.at n=32A107036
• Fajtlowicz p-primes.at n=56A185955
• Primes that remain prime when a single digit 9 is inserted between any two consecutive digits or as the leading or trailing digit.at n=33A215421
• Numbers n such that (2^n+1)/3 is prime, but cannot be written in the form a^2 + 3*b^2.at n=16A216551
• Numbers k such that (2^k + 1)/(2 - (-1)^k) is a prime.at n=36A280083
• Irregular triangle where row n lists primes q below the n-th primorial such that the multiplicative order of q mod the n-th primorial is 2. I.e., such primes q having the least k such that q^k (mod primorial(n)) == 1 is 2.at n=39A336015
• Wagstaff numbers that are of the form 4*k + 1.at n=11A361563
• Prime numbersat n=9193