127721

Appears in sequences

• Concatenation of n-th prime and its reverse.at n=30A067087
• If p(x) is the x-th prime, then the n-th set of 5 consecutive sexy prime pairs starts at p(a(n)).at n=13A095964
• Palindromic numbers which can be written as the sum of two or more consecutive squares.at n=31A216446
• a(n) = n^4/8 + (5*n^3)/12 - n^2/8 - (5*n)/12 + 1.at n=32A226639
• Sum of the smallest parts of the partitions of 4n into 4 parts.at n=31A238702