215 , 51456, 69660, 92020, 541456
51456, 69660, 92020, 541456 are even and congruent to 10^n mod 41
pg(51456), pg(69660), pg(92020) and pg(541456) are prp
51456, 69660, 92020, 541456 are all congruent to 7*2^q1 mod 13 with q a nonnegative integer
215 is odd and pg(215) is prp
215 is congruent to 7*2^q mod 13
