Numbers m such that 20*m + 1, 80*m + 1, 100*m + 1, and 200*m + 1 are all primes.

Terms

a(0) =333a(1) =741a(2) =1659a(3) =1749a(4) =2505a(5) =2706a(6) =2730a(7) =4221a(8) =4437a(9) =4851a(10) =5625a(11) =6447a(12) =7791a(13) =7977a(14) =8229a(15) =8250a(16) =9216a(17) =10833a(18) =12471a(19) =13950a(20) =14028a(21) =15147a(22) =16002a(23) =17667a(24) =18207a(25) =18246a(26) =19152a(27) =20517a(28) =23400a(29) =23421