390050

Appears in sequences

• Numerators of continued fraction convergents to sqrt(98).at n=9A041176
• a(n) = 2*a(n-1) + a(n-2), with a(0) = 1, a(1) = 2, a(2) = 4.at n=15A052542
• Numbers k such that 2*k^2 - 4 is a square.at n=7A075870
• Series ratios converge alternately to sqrt(2) and 1+sqrt(1/2).at n=30A082766
• a(n) = (a(n-1) mod 2)*a(n-1) + a(n-2) with a(0)=0, a(1)=1.at n=45A097564
• Numerators of "Farey fraction" approximations to sqrt(2).at n=31A119016
• Fixed-j dispersion for Q = 8: Square array D(g,h) (g, h >= 1), read by ascending antidiagonals.at n=43A120860
• Numerators of principal and intermediate convergents to 2^(1/2).at n=28A143607
• Numerators of the upper principal and intermediate convergents to 2^(1/2).at n=14A143609
• Numerators of fractions in a 'zero-transform' approximation of sqrt(2) by means of a(n) = (a(n-1) + c)/(a(n-1) + 1) with c=2 and a(1)=0.at n=15A163271
• Largest number x such that the greatest prime factor of x^2-2 is A038873(n), the n-th prime not congruent to 3 or 5 mod 8.at n=5A185396
• Two column recursive array A(n,k), relating expressions based on half-squares (A007590) to each other and several other sequences, read by rows.at n=47A227972
• Triangle read by rows in which row n lists numbers k such that the greatest prime factor of k^2 - 2 is A038873(n), the n-th prime not congruent to 3 or 5 mod 8.at n=26A242488
• List of triples (r,s,t): the matrix M = [[1,4,4][1,3,2][1,2,1]] is raised to successive powers, then (r,s,t) are the square roots of M[3,1], M[1,1], M[1,3] respectively.at n=47A249576
• List of triples (r,s,t): the matrix M = [[1,4,4][1,3,2][1,2,1]] is raised to successive negative powers, then (r,s,t) are the square roots of M[3,1], M[1,1], M[1,3] respectively.at n=42A249577
• Lexicographically earliest sequence of distinct positive integers with no finite subset summing to a positive Pell number (A000129).at n=35A354005