1078282205

Appears in sequences

• Product of 8 successive primes.at n=2A046326
• Denominator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.at n=28A072983
• a(1) = 1; for n>1, a(n) = a(n-1)*n if n is prime, a(n) = a(n-1)/n if n is composite dividing a(n-1) else a(n) = a(n-1).at n=28A085087
• a(1) = 1; for n>1, a(n) = a(n-1)*n if n is prime, a(n) = a(n-1)/n if n is composite dividing a(n-1) else a(n) = a(n-1).at n=29A085087
• Smallest deficient number with n distinct prime factors.at n=7A087234
• Least number k having exactly n distinct prime divisors and the Stern polynomial B(k,x) is irreducible.at n=7A186886
• Odd squarefree n not divisible by 3 such that n/phi(n) > 2, where phi is Euler's totient function.at n=4A215130
• Smallest number k such that the n prime distinct divisors of k are also n consecutive divisors of k.at n=7A227105
• Denominators of r(n) = r(n-1) + r(n-2) + B_(n-2), where B_n is the n-th Bernoulli number A027641(n)/A027642(n).at n=30A228151
• Transpose of square array A255483.at n=47A276578
• Transpose of square array A277810.at n=62A277809
• Square array A(r,c) = A019565(A277820(r,c)), read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.at n=58A277810
• Smallest deficient number which is the product of n consecutive primes.at n=8A308938
• a(n) is the denominator of the sum of the reciprocals of the first n squarefree numbers.at n=17A354418
• Lexicographically earliest sequence of distinct positive integers such that a(n) is the least novel multiple of m, the product of all primes q < gpf(a(n-2)*a(n-1)) which do not divide a(n-2)*a(n-1); a(1) = 1, a(2) = 2.at n=45A364280
• Denominators of the partial sums of the reciprocals of the powerfree part function (A055231).at n=29A379580