87640

Appears in sequences

• Numbers n such that n and the four successive integers produce primes if substituted for x in the polynomial 5x^2+5x+1. See A090562, A090563. Terms show that longer similar chains also exist.at n=35A090100
• Numbers k such that there are equal numbers of 0's and 1's and equal numbers of 2's and 3's among the first k digits of the quaternary representation of Pi.at n=2A339450
• Expansion of (1-x^2) / (1-x-4*x^2+2*x^3).at n=14A384604