81971

Properties

Appears in sequences

• Primes p such that p + 2, 18*p^2 + 1, and 18*(p+2)^2 + 1 are all primes.at n=24A115272
• Expansion of (3+3*x-25*x^2-3*x^3+2*x^4)/((1-x)*(1-10*x^2+x^4)).at n=10A180483
• Values of k such that k^2 + 9 is a triangular number (A000217).at n=12A276601
• Numbers k such that F(k)*F(k+1) - F(k+2) is prime, where F = A000045.at n=47A305415
• Prime numbersat n=8016