A153166 Numbers n with property that 6n+1 is prime and uses only digits 2 and 3.

37, 5372, 5387, 5537, 38722, 38887, 53872, 388722, 388887, 537037, 537222, 538887, 555372, 3703887, 3705372, 3705387, 3870372, 3870537, 3887037, 5387037, 5537037, 37220537, 37222222, 38705372, 38705537, 38870372, 38870537, 53703887