Additive Primes and their Indices

These primes are of the type that the sum of their digits also add up to prime number. For example, 23 is an additive prime since 2 + 3 = 5 is a prime, but 19 is not an additive prime because 1 + 9 = 10 is a composite.

Table of Additive primes*

Index	Additive Prime
1	2
2	3
3	5
4	7
“	“
12	67
“	“
“	“
19	139
42	359
“	“
548	9127

In the above table we see that the 19^th additive prime is 139 and 139 is the number of letters in the first chapter in the Quran called the “Opener”. The 42^nd additive prime is 359 which is actually the 19^th “Emirp”. We do have the following relation.

19 × 42 = 798 which is the frequency of K, Ha, Ya, Ain, S is sura 19.

The 548^th additive prime is 9127 and the 548^th composite is 670. A look at the number of verses in the un-initialed suras in the Quran reveals that 670^th such verse is 9:127.