135479
This number is a prime.
The smallest prime p such that replacing each digit d in
decimal expansion of p with d^2 yields alternately a new
semiprime and a new prime when done recursively five times,
i.e., 135479 -> 1925164981 (semiprime); 1925164981->
1814251361681641 (prime); 1814251361681641->
164116425193613664136161 (semiprime);
164116425193613664136161->
136161136164251819361936361619361361 (prime);
136161136164251819361936361619361361->
1936136119361361642516418193618193693613618193619361
(semiprime). [Bajpai]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell