87539

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of the function f(x) = 2*x + 1.at n=35A023272
• Primes starting a Cunningham chain of the first kind of length 4.at n=25A059763
• Primes p such that p+2, 2p+1, and 2p+3 are also prime.at n=27A069142
• Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d=2,4 or 6) and forming d-pattern=[2, 6,6]; short d-string notation of pattern = [266].at n=27A078849
• Primes p such that the differences between the 5 consecutive primes starting with p are (2,6,6,4).at n=8A078950
• Primes of the form 4*k-1 such that 8*k-1, 16*k-1 and 32*k-1 are also primes.at n=13A101795
• a(n) = prime(k) with k = n^2 + prime(n)^2.at n=23A243892
• Numbers n such that n is a twin prime and 2n + 1 is a twin prime.at n=28A261463
• Consider the Euler totient function of a number x. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.at n=16A269309
• Lesser of twin primes P(k) and P(k+1) such that Sd(P(k)) + Sd(P(k+1)) = Sd(k) + Sd(k+1), where Sd(x) is the sum of digits of x.at n=14A277111
• Primes p such that p + 8, p + 14, p + 18 and p + 20 are also primes.at n=23A385035
• Prime numbersat n=8497