131149

Properties

Appears in sequences

• a(n) is the n-th prime that ends with prime(n), or 0 if there do not exist n primes ending with prime(n).at n=34A089778
• Smallest prime obtained as a concatenation of prime(n) and prime(m) with m > n.at n=31A113893
• Q-residue of the triangle A038207 of coefficients of (x+2)^n, where Q is the triangle given by t(i,j)=1 for 0<=i<=j. (See Comments.)at n=6A193660
• Number of bicolored trees on n unlabeled nodes such that black nodes are not adjacent to each other.at n=12A339830
• Prime numbersat n=12257