61231

Properties

Appears in sequences

• Primes such that the sum of their digits and the sum of the reciprocals of their digits is also prime.at n=23A064779
• Primes in A005891 = Centered pentagonal numbers: (5n^2 + 5n + 2)/2.at n=24A145838
• Primes such that swapping some pair of digits gives a square.at n=38A171585
• Numbers n of the form 4*k+3 such that 2^(m-1) == 1 (mod m) where m = (2*n-1)*n.at n=11A187923
• Primes whose sum of reciprocal of digits is a prime.at n=25A266815
• Primes that can be generated by the concatenation in base 7, in descending order, of two consecutive integers read in base 10.at n=37A287309
• Prime numbers p such that the product of their prime digits is equal to the product of their nonprime digits, where p has at least one prime digit.at n=30A369877
• Prime numbersat n=6163