26839

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 92 ones.at n=20A031860
• Denominators of continued fraction convergents to sqrt(15).at n=10A041023
• Prime number spiral (clockwise, South spoke).at n=27A054566
• Primes p such that p and p^2 have same digit sum.at n=34A058370
• a(n) = 8*a(n-1) - a(n-2), a(0)=1, a(-1)=1.at n=5A070997
• a(n)*a(n+3) - a(n+1)*a(n+2) = 3, given a(0)=a(1)=1, a(2)=4.at n=11A080871
• Diagonal T(n+2,n) of array A094954.at n=5A094956
• Odd primes p such that the number of primes less than p that are congruent to 1 (mod 4) is equal to the number of primes less than p that are congruent to 3 (mod 4).at n=5A096447
• Fixed points for prime number permutation A108546.at n=11A108547
• Primes for which the weight as defined in A117078 is 11 and the gap as defined in A001223 is 10.at n=28A119596
• Numerators in continued fraction expansion of sqrt(3/5).at n=10A145542
• Smallest prime p such that there is a prime q satisfying (2*n + 1)*p^2 - (2*n-1)*q^2 = 2, or 0 if no such p exists.at n=1A225835
• The number triangle associated with the polynomials V_n(x).at n=49A228637
• Generalized Markoff numbers: largest number a in a 5-tuple a >= b >= c >= d >= e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 4*a*b*c*d*e.at n=16A229241
• Primes p such that both (p^2 + 5)/6 and (p^4 + 5)/6 are prime.at n=21A253925
• Primes that can be generated by the concatenation in base 3, in descending order, of two consecutive integers read in base 10.at n=31A287301
• Number of odd strict trees of weight n (all outdegrees are odd).at n=25A300440
• Slowest increasing sequence of primes such that a(n - 1) + a(n) and a(n - 1)^2 + a(n)^2 are both semiprimes, with a(1)=2.at n=22A365050
• Prime numbersat n=2944