768867

Appears in sequences

• Number of 5-tuples (v1,v2,v3,v4,v5) of nonnegative integers less than n such that v1 <= v5, v2 <= v5, v2 <= v4 and v3 <= v4.at n=21A085461
• a(1) = 2; then least palindrome greater than the previous term such that every partial concatenation is a prime.at n=21A088084