217519

Properties

Appears in sequences

• Consider primitive solutions (x,y,z) to x^4+y^4+z^4=w^4 with 0<x<=y<=z arranged in order of increasing w; sequence gives y values.at n=0A078519
• Numbers k such that k^4 = x^4 - y^4 - z^4.at n=1A175598
• Least prime p such that the continued fraction expansion of its square root contains the first n natural numbers, but does not contain n+1.at n=27A185808
• Least number k such that the continued fraction expansion of its square root contains the first n natural numbers.at n=27A187261
• a(n) is the least number such that d(a(n)) = d(R(a(n)))/n, where R(n) is the digit reverse of n and d(n) is the number of divisors of n.at n=26A284495
• Prime numbersat n=19410