4190210

Appears in sequences

• Numerators of continued fraction convergents to sqrt(179).at n=13A041330
• Write fundamental unit for real quadratic field of discriminant n as x + y*omega; sequence gives values of x for n == 3 mod 4.at n=36A053372
• Let p = n-th prime of the form 4k+3, take smallest solution (x,y) to the Pellian equation x^2 - p*y^2 = 1 with x and y >= 1; sequence gives value of x.at n=21A081231
• a(n) = 6561*n^2 - 9558*n + 3482.at n=26A156773
• Number of bitstrings of length n which (if having two or more runs) the last two runs have different lengths.at n=21A208900
• The positive fundamental solutions x = x0(n) for the Pell equation x^2 - d*y^2 = +1 with odd y = y0(n). Then d coincides with d(n) = A007970(n).at n=54A262027