23461

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=28A031848
• Numerators of continued fraction convergents to sqrt(149).at n=7A041272
• Numerators of continued fraction convergents to sqrt(596).at n=9A042142
• Integers of the form (x^3)/6 + (x^2)/2 + x + 1.at n=17A127876
• Let f(z) = z^2 + c, then row k lists the expansion of the n-fold composition f(f(...f(0)...)) in rising powers of c.at n=53A137560
• Positive numbers y such that y^2 is of the form x^2+(x+809)^2 with integer x.at n=7A160203
• Numbers n such that 41#*2^n-1 is prime, where # denotes the primorial, A002110.at n=77A176061
• Partial sums of A003407 (starting at n=1).at n=12A178155
• Triangle by rows, related to the numbers of binary trees of height less than n, derived from the Mandelbrot set.at n=47A202019
• a(n) = floor(5*prime(n)^2 / 4).at n=32A246010
• Consider a number x. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach the arithmetic derivative of x.at n=25A269312
• Incrementally largest values of minimal x satisfying the equation x^2 - D*y^2 = 5, where D is a prime number.at n=4A341080
• Centered 10-gonal numbers which are products of two primes.at n=29A367792