57241

Properties

Appears in sequences

• Primes p such that p*(p-2) divides 2^(p-1)-1.at n=17A081762
• If a,b are prime numbers satisfying the Diophantine equation a^3+b^3=c^2, then a is -1 mod 12 and b is 1 mod 12, or vice versa. Choose 'b' to be 1 mod 12. This is the sequence of 'b' values, sorted by the magnitude of c.at n=6A099807
• Primes that are a concatenation of 5, 7 and a prime.at n=18A101249
• k times k+7 gives the concatenation of two numbers m and m-1.at n=4A116283
• Values of p in A145767.at n=7A145797
• Primes of the form p^2 + (p + 1)/2 where p is also prime.at n=13A164580
• Noncomposite numbers in the eastern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=29A168022
• Primes of the form 5*k^2 - 4.at n=25A201786
• Numbers n such that (n^n-2)/(n-2) is an integer.at n=42A242787
• Numbers n such that (n-1)^2-1 divides 2^(n-1)-1.at n=18A260406
• Prime numbersat n=5805