51839

Properties

Appears in sequences

• Positions of 5-digit terms in the continued fraction for Pi (3 is position 0).at n=4A048961
• Numbers n such that 159*2^n-1 is prime.at n=26A050831
• Least prime in A031932 (lesser of 14-twins) whose distance to the next 14-twin is 6*n.at n=20A052356
• Least inverse of A056796.at n=24A056817
• Primes of the form 16*k-1 such that 4*k-1 and 8*k-1 are also primes.at n=25A101793
• Primes p such that the decimal expansion of p remains prime under two iterations of base-10 to base-2 conversions.at n=14A123266
• a(n) = (n! - 7)/7.at n=2A139177
• Primes of the form 10*k^2 - 1.at n=12A143828
• a(n) = 40*n^2 - 1.at n=35A158598
• Positions of the records of the positive integers in A179319; a(n) is the first position in A179319 equal to +n.at n=6A183555
• Positions of records in A179319 for both positive and negative integers; A183555 and A183556 merged together.at n=15A183557
• Primes of the form 2n^2 - 3.at n=36A201712
• Number of (n+1)X(3+1) 0..3 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..3 introduced in row major order.at n=8A231459
• Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 3 and no row sum 1 and no column sum 1.at n=20A257439
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 446", based on the 5-celled von Neumann neighborhood.at n=15A282264
• Primes of the form k!/7 - 1.at n=1A290120
• Primes of the form 2^a * 3^b * 5^c - 1 for positive a, b, c.at n=40A293425
• Numbers m such that Conv(b,m) = b has a unique nontrivial solution (b = 0 and b = 1 are considered trivial solutions). Here, Conv(b,m) denotes the limit of b^^t (mod m) as t goes to infinity.at n=29A347561
• Prime numbersat n=5304