901273

Properties

Appears in sequences

• a(n) = 6*a(n-2) - a(n-4).at n=17A006452
• a(n) = 6*a(n-1) - a(n-2), n >= 2, a(0)=1, a(1)=4.at n=8A038723
• Primes p such that p^2-1 is a triangular number.at n=5A078699
• Numbers k such that phi(k)*sigma(k) is a triangular number.at n=22A115911
• Sequences A006452 and A216134 interlaced.at n=34A216162
• Expansion of (1 + 6*x + 17*x^2 - x^3 - 3*x^4)/(1 - 6*x^2 + x^4).at n=14A227792
• a(n) = sqrt(A299921(n)).at n=25A301318
• Prime numbersat n=71371