151201

Properties

Appears in sequences

• Number of isolated-pentagon (IPR) fullerenes with 2n vertices (or carbon atoms).at n=41A046880
• Primes arising in A084728.at n=6A084729
• Primes p such that tau(p-1)+tau(p+1) is larger than for any previous term. (Smallest prime sandwiched between more composite numbers.)at n=36A090481
• Triangle read by rows: T(n,m) = 1 + ((-1 + binomial(n, m))*(n!)^2)/(m!*(n - m)!).at n=23A174790
• Triangle read by rows: T(n,m) = 1 + ((-1 + binomial(n, m))*(n!)^2)/(m!*(n - m)!).at n=25A174790
• Primes of the form 2520k + 1 for some k.at n=22A217588
• Largest number in an integer 6-tuple (a, b, c, d, e, f) satisfying the Markoff(6) equation a^2+b^2+c^2+d^2+e^2+f^2 = 6*a*b*c*d*e*f.at n=10A227206
• E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n / n!.at n=10A259208
• Primes of the form (p^2+p+1)/3 where p is prime.at n=17A338299
• Number of subsets of the first n perfect powers whose sum is a perfect power.at n=22A377125
• Prime numbersat n=13950