144541

Properties

Appears in sequences

• Number of mobiles (circular rooted trees) on n nodes with thinning limbs.at n=16A124345
• Sums of the form (twin primes + 1) which are also an upper twin prime.at n=21A158870
• Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and 0 <= determinant <= n.at n=20A211146
• Emirps (A006567) whose difference with the reversal is a perfect square.at n=16A217386
• Number of irreducible matrices X of all sizes with nonnegative integral entries satisfying X^2 = nX.at n=13A280782
• a(n) is the greatest prime factor of a(n-2)^2 + a(n-1)^2 where a(1)=2 and a(2)=3.at n=7A361520
• Prime numbersat n=13385