27059

Properties

Appears in sequences

• a(0)=a(1)=3; thereafter a(n) = a(n-1) + a(n-2) + 1.at n=19A022403
• a(0)=3, a(1)=7; thereafter a(n) = a(n-1) + a(n-2) + 1.at n=18A022406
• Primes that remain prime through 4 iterations of function f(x) = 9x + 2.at n=18A023324
• a(n)=Sum{T(n,j): j=1,2,...,n}, array T given by A048225.at n=31A048235
• 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=10A078849
• Primes p such that the differences between the 5 consecutive primes starting with p are (2,6,6,4).at n=2A078950
• Primes p of the form k*(k + 1) - 1 such that p and p + 2 are twin primes.at n=22A088486
• a(n) = (1/n!)*A001565(n).at n=29A094792
• Number of odd composites between 2^n and 2^(n + 1).at n=16A094812
• Indices of primes in sequence defined by A(0) = 41, A(n) = 10*A(n-1) + 51 for n > 0.at n=18A101729
• Primes of the form 4*n^2 + 2*n -1.at n=40A155737
• Primes of the form (p^2-1)/4-p where p are also primes.at n=26A165557
• Primes of the form p^2 +3p + 1, where p is also a prime.at n=17A165944
• Primes p such that 3*p+4, 5*p+6 and 7*p+8 are also prime.at n=26A173879
• Numbers that have 10 terms in their Zeckendorf representation.at n=29A179250
• Number of nondecreasing arrangements of n+3 numbers in 0..4 with each number being the sum mod 5 of three others.at n=22A183899
• Primes that indicate that the total frequency of every decimal digit in the set of all primes up to and including that prime is odd.at n=2A192448
• Number of (w,x,y,z) with all terms in {1,...,n} and w*x+y*z>=n^2.at n=23A212132
• Lesser of consecutive primes whose average is an oblong number.at n=40A242383
• Primes arising from A249567.at n=10A249568