53849

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of the function f(x) = 2*x + 1.at n=24A023272
• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=4A023302
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 92.at n=1A031680
• Initial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.at n=2A059764
• Primes of the form 16*m^2 + 25 for m=1,2,3,...at n=22A087857
• Smallest primes starting a complete four iterations Cunningham chain of the first or second kind.at n=6A110027
• Primes p such that none of p-2, p-1, p+1, and p+2 is squarefree.at n=27A153215
• A proximate-prime polynomial sequence generated by 2*n^2 - 2*n + 53089.at n=19A155557
• Transform of Catalan numbers whose Hankel transform gives the Somos-4 sequence.at n=12A157002
• Least prime k such that k*2^n + 1 divides 2^k - 1, or 0 if no such prime exists.at n=9A219341
• Primes p of the form x^2 + y^2 such that q = (x^2 + 1)/y^2 is a prime less than p.at n=4A282341
• Triangle read by rows: coefficients of type B alternating Eulerian polynomials.at n=29A343170
• Triangle read by rows: coefficients of type B alternating Eulerian polynomials.at n=34A343170
• Prime numbersat n=5485