47874

Appears in sequences

• Largest palindromic substring in 9^n.at n=36A046267
• Palindromes with exactly 4 distinct prime factors.at n=23A046394
• Triangle T(n,k) of series-reduced (or homeomorphically irreducible) graphs with loops on n labeled nodes and with k edges, k=0..binomial(n+1,2).at n=56A060517
• A symmetrical triangle of polynomial coefficients based on the Hermite polynomials with leading coefficient adjusted to one: p(x,n)=HermiteH[n,x]-HermiteH[0,x]+x^n*(HermiteH[n,1/x]-HermiteH[0,1/x]).at n=49A176064
• A symmetrical triangle of polynomial coefficients based on the Hermite polynomials with leading coefficient adjusted to one: p(x,n)=HermiteH[n,x]-HermiteH[0,x]+x^n*(HermiteH[n,1/x]-HermiteH[0,1/x]).at n=50A176064
• Number of (n+1) X (1+1) 0..3 arrays with every 2 X 2 subblock summing to a prime.at n=3A251452
• Number of (n+1)X(4+1) 0..3 arrays with every 2X2 subblock summing to a prime.at n=0A251455
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to a prime.at n=6A251459
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to a prime.at n=9A251459
• Number of partitions of n with up to two distinct kinds of 1.at n=45A320689
• Products k of 4 distinct primes (or tetraprimes) such that none of k-2, k-1, k+1 and k+2 is squarefree.at n=32A364766
• a(n) is the first number that is the sum of two palindromic primes in exactly n ways.at n=11A379138