What is the smallest positive integer k such that k+1, 2k+1, 3k+1, 4k+1 are all primes?
(In reply to
computer solution by Charlie)
The OEIS has a couple of sequences I found using Charlie's results:
A237189: "Numbers n such that n+1, 2n+1, 3n+1, 4n+1 are four primes." 330, 1530, 3060, 4260, 4950, 6840, 10830, 15390, 18120, 23010, ...
A088250 "a(n) = smallest number k such that rk + 1 is prime for all r = 1 to n." 1, 1, 2, 330, 10830, 25410, 512820, 512820, 12960606120, 434491727670, ...
re: computer solution - OEIS findings
