133293

Appears in sequences

• a(n) is the number of (2n+1)-digit palindromic primes that undulate.at n=7A057332
• Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that the set {p(i)-i, i=1,2,...,n} has exactly k elements (1<=k<=n).at n=42A125182