## Tuesday, April 5, 2011

### 2-digit primes and flipping primes

Flip Text Converter http://www.fliptext.org/

List of 2-digit prime numbers

2-digit prime numbers "ab"
To flip ab + a^b becomes = q^ɐ + qɐ

11: 11 + 1^1 = 12 (= 2^2 * 3)
13: 13 + 1^3 = 14 (= 2 * 7)
17: 17 + 1^7 = 18 (= 2 * 3^2)
19: 19 + 1^9 = 20 (= 2^2 * 5)
23: 23 + 2^3 = 31 (prime) flip it -> 3^2 + 32 = 41 (a prime number)
29: 29 + 2^9 = 541 (prime) flip it -> 6^2 + 62 = 98 (= 2 * 7^2)
31: 31 + 3^1 = 34 (= 2 * 17)
37: 37 + 3^7 = 2224 (= 2^4 * 139)
41: 41 + 4^1 = 45 (= 3^2 * 5)
43: 43 + 4^3 = 107 (prime) flip it -> 3^4 + 34 = 115 (= 5 * 23)
47: 47 + 4^7 = 16431 (= 3 * 5477)
53: 53 + 5^3 = 178 (= 2 * 89)
59: 59 + 5^9 = 1953184 (= 2^5 * 67 * 911)
61: 61 + 6^1 = 67 (prime) flip it -> 1^9 + 19 = 20 (= 2^2 * 5)
67: 67 + 6^7 = 280003 (= 19 * 14737)
71: 71 + 7^1 = 78 (= 2 * 3 *13)
73: 73 + 7^3 = 416 (= 2^5 * 13)
79: 79 + 7^9 = 40353686 (= 2 * 20176843)
83: 83 + 8^3 = 595 (= 5 * 7 * 17)
89: 89 + 8^9 = 134217817 (= 31 * 67 * 64621)
97: 97 + 9^7 = 4783066 (= 2 * 2391533)