21289

Appears in sequences

• Numbers k where cos(k) decreases monotonically to 0.at n=33A046957
• Numbers k where sin(k) increases monotonically to 1 (or cosec(k) decreases).at n=37A046959
• Expansion of 1/(1-x^2-2*x^3).at n=26A052947
• Numbers n such that [A070080(n), A070081(n), A070082(n)] is an isosceles integer triangle with integer area.at n=31A070145
• Expansion of (1-x)/((1-x)^2 - 4*x^3).at n=13A097117
• Expansion of (1 + x)^2 / ((1 - x^2 - 2*x^3)*(1 + x^4)).at n=24A107849
• Expansion of x^2/(1-x^2-2*x^3).at n=28A159287
• Diagonal sums of the Riordan array (1-4*x+4*x^2, x*(1-2*x)) (A167431).at n=22A167434
• Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime.at n=26A255967
• G.f.: 2*x*(1-x*sqrt(1-4*x))/((1+2*x^2+sqrt(1-4*x))*sqrt(1-4*x)).at n=9A278023
• Consecutive states of the linear congruential pseudo-random number generator 170*s mod 30323 when started at s=1.at n=8A385033