%I #13 Mar 08 2023 19:55:46
%S 2,6,354,210,43860,463980,189583590,6958972020,200007607800,
%T 60958204112190,3337686588286050
%N a(n) is the smallest number m such that m has n distinct prime divisors and if p is a prime divisor of m then p*m +1 is prime.
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_334.htm">Puzzle 334. Farideh & the 2004 year</a>, The Prime Puzzles & Problems connection.
%e a(7)=189583590 because 189583590=2*3*5*7*41*97*227, all the seven numbers 2*189583590+1, 3*189583590+1, 5*189583590+1, 7*189583590+1, 41*189583590+1, 97*189583590+1 and 227*189583590+1 are prime numbers and 189583590 is the smallest number m with such property.
%Y Cf. A092023.
%Y Cf. A112723, A112724.
%K more,nonn
%O 1,1
%A _Farideh Firoozbakht_, Feb 19 2004
%E a(10) from _Michael S. Branicky_, Feb 27 2023
%E a(11) from _Michael S. Branicky_, Mar 08 2023