53017

Properties

Appears in sequences

• a(n) is the least prime p, such that next_prime(2*p) - 2*p = 2*n - 1.at n=26A059846
• Number of divisors d of n! such that d+1 is prime.at n=24A067847
• Primes of the form 6*k^2 + 1.at n=25A090687
• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the second column (n>=1, k>=0). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=38A121581
• Primes p such that lcm(1,2,3,...,p-2,p-1,p) - 1 is prime.at n=28A154524
• Number of nX2 0..2 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=23A201426
• Number of partitions of n such that m(2) < m(3), where m = multiplicity.at n=49A240063
• a(n) = Sum_{d|n} d^2 * (d+1)/2.at n=46A278403
• Prime powers k such that lcm(1, 2, 3, ..., k)-1 is prime.at n=31A385564
• Prime numbersat n=5410