43441

Properties

Appears in sequences

• Define b(0)=28, b(n+1)=2*b(n)+1; sequence gives largest prime factor of b(n).at n=18A113972
• Primes of the form 1+2*n+3*n^2.at n=16A122430
• Smallest prime factor of composite Mersenne numbers: lpf(2^p-1) where 2^p-1 is composite and p is prime.at n=29A136030
• Prime numbers p such that p +- ((p-1)/8) are primes.at n=17A137771
• Odd primes which can never divide 2^a+2^b+1.at n=35A179113
• Least prime p such that pi(p*n)^2 = pi(q*n)^2 + pi(r*n)^2 for some primes q and r, where pi(x) denotes the number of primes not exceeding x.at n=48A257364
• Number of length n inversion sequences avoiding the patterns 110, 120, 201, and 210.at n=9A279568
• Smallest beastly prime in base n: smallest prime p with a base-n expansion containing the substring 666.at n=12A286342
• Primes of the form 6k + 1 preceding the first-occurrence gaps in A330853.at n=17A330854
• Primes p such that the order of 2 mod p is less than the square root of p.at n=33A333245
• Prime numbersat n=4529