31817

Properties

Appears in sequences

• 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 12.at n=29A031600
• Floor[X/Y] where X = concatenation in increasing order of first n powers of 3 and Y = that of first n natural numbers.at n=4A067098
• Smaller of two consecutive prime numbers such that p1*p2*d - d = average of twin prime pairs, d (delta) = p2 - p1.at n=3A153378
• Consecutive pairs of prime point sums in A161191 (includes triples).at n=20A161192
• Primes p such that x^41 = 2 has a solution mod p, and p is congruent to 1 mod 41.at n=2A190758
• Primes of the form 3n^2 - 10.at n=16A201782
• n-th prime p such that (p+n)^2+n is prime but (p+j)^2+j is not prime for all 0<j<n.at n=27A238663
• Lexicographically largest increasing sequence of primes for which the continued square root map (see A257574) produces the decimal expansion of e (Euler's number).at n=28A257764
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 934", based on the 5-celled von Neumann neighborhood.at n=44A273794
• a(n) = A365737(10^n).at n=9A365738
• Prime numbersat n=3420