- The 19th Semi-Prime is 55.
- 55 = 5 × 11
- The 3rd and 5th Primes are 5 and 11.
- 35th Prime is 149.
- 149 is an Emirp and it is the 11th such Prime.
- The Emirp of 149 is 941 and it is the 31st such Prime.
- 941st Composite is 1131 and 1131st Prime is 9127.
- Note, the indices of Emirps 149 and 941 are 11 and 31.
- Again, 1131st Prime is 9127.
