19159

Appears in sequences

• Numbers k where cos(k) decreases monotonically to 0.at n=30A046957
• Numbers k where sin(k) increases monotonically to 1 (or cosec(k) decreases).at n=34A046959
• Least m such that Phi-Composite-Harmonic series Sum_{k=1..m} 1/A000010(A002808(k)) >= n.at n=14A074470
• Difference between squares of legs of primitive Pythagorean triangles, sorted (with multiplicity).at n=33A127923
• Totally multiplicative sequence with a(p) = a(p-1) + 6 for prime p.at n=43A166703
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+161)^2 = y^2.at n=27A206426
• a(n)^2 is the start of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=40A340663