At least 3 out of 10m+1, 10m+3, 10m+7, 10m+9 are primes.

Terms

a(0) =1a(1) =4a(2) =7a(3) =10a(4) =13a(5) =19a(6) =22a(7) =31a(8) =43a(9) =46a(10) =61a(11) =64a(12) =82a(13) =85a(14) =88a(15) =103a(16) =106a(17) =109a(18) =130a(19) =142a(20) =145a(21) =148a(22) =160a(23) =166a(24) =169a(25) =178a(26) =187a(27) =199a(28) =208a(29) =238