212519

Appears in sequences

• Frobenius number of the numerical semigroup generated by consecutive squares.at n=19A069756
• Brilliant numbers such that when they are concatenated with their 10's complement, which also must be brilliant, the result is a prime.at n=16A084629
• Subset of A037165 (p(n)*p(n+1)-p(n)-p(n+1)) for twin primes.at n=23A137367