- 353 is the exponent of the 19th Gaussian Mersenne Prime.
- 353 is the sum of the frequencies of H and M is sura 42.
- Semiprimes that are not square numbers are called discrete, distinct, or squarefree semiprimes. (Wikipedia)
- 353rd such semiprime is 1238.
- The digits of 1238 are the indices of Primes 2, 3, 5,and 19.
- 570 = 2 × 3 × 5 × 19
- 9127 is the 570th Gaussian Prime.
- 570 is the sum of frequencies of A, L, M is sura 32.
