51257

Properties

Appears in sequences

• [ n(n-1)(n-2)(n-3)/7 ].at n=26A011917
• a(1) = 7, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).at n=7A063384
• Take A000040, omit commas: 23571113171923..., select 5-digit primes seen when scanning from left.at n=25A073038
• List of primes of the form 25n^2-36n+13 with n>=0.at n=12A154354
• Primes of the form (p^2-2)/7, where p is also a prime number.at n=13A165668
• Primes that can be generated by the concatenation in base 7, in ascending order, of two consecutive integers read in base 10.at n=39A287308
• Prime numbersat n=5245