57251

Properties

Appears in sequences

• Primes p such that 2^p-1 and the p-th Fibonacci number have a common factor. Prime terms of A074776.at n=24A080050
• Primes that are a concatenation of 5, 7 and a prime.at n=19A101249
• a(n) = 17 + floor( (1 + Sum_{j=0..n-1} a(j))/2 ).at n=20A120143
• Constant term of the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.at n=19A192748
• Primes of the form 5n^2 + 6.at n=15A201484
• Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..1 nX2 array.at n=8A220275
• T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..1 nXk array.at n=46A220279
• Primes of the form k^4 + 29*k^2 + 101.at n=15A272075
• Initial member of 6 consecutive primes a, b, c, d, e, f such that both (f + a)/(d - c) and (e + b)/(d - c) are prime.at n=23A293619
• Sum of the squarefree parts of the partitions of n into 9 parts.at n=37A309485
• Prime numbersat n=5806