512820

Appears in sequences

• a(n) is the smallest number k such that r*k + 1 is prime for all r = 1 to n.at n=6A088250
• a(n) is the smallest number k such that r*k + 1 is prime for all r = 1 to n.at n=7A088250
• a(n) = smallest positive m such that k*m+1 is prime for k=2..n.at n=7A173750
• Sums of 2 distinct primorials.at n=25A177689
• Numbers with prime factorization pqrst^2u^2.at n=21A190380
• Least k such that x*k + 1 produces primes for x = 1..n and composite for x = n + 1.at n=7A202778
• a(n) = lcm(n,p1,p2,...,pk) for such a partition of n which maximizes this value among all partitions {p1+p2+...pk} of n.at n=37A225646
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1, 5k+1 are five primes.at n=17A237190
• Square array A(row,col) read by antidiagonals: A(1,col) = A276155(col), and for row > 1, A(row,col) = A276154(A(row-1,col)); Dispersion of primorial base left shift A276154 (array transposed).at n=50A276943
• Square array A(row,col): A(row,1) = A276155(row), and for col > 1, A(row,col) = A276154(A(row,col-1)); Dispersion of primorial base left shift A276154.at n=49A276945
• Smallest member of bi-unitary sociable quadruples.at n=9A319915
• A276085 applied to the intersection of A048103 (p^p-free numbers) and A276156 (sums of distinct primorials).at n=21A328833
• Numbers k such that A276086(k) is a sum of distinct primorial numbers.at n=16A328836
• Numbers k such that k + 1, 2k + 1, 3k + 1, 4k + 1, and 6k + 1 are all prime.at n=14A333721
• Triangle read by rows: T(n,k) = A002110(n) + A002110(k), 0 <= k <= n; sums of two primorials, not necessarily distinct.at n=33A370121
• Triangle read by rows: T(n,k) = A002110(n) + A002110(k), 1 <= k <= n; sums of two primorials > 1, not necessarily distinct.at n=25A370134