## Sunday, October 23, 2016

### Fun with Primes: Sum of Primes

Fun with Primes:  Sum of Primes

Primes Composed of a Sum of Primes

Separated by 2

5 = 2 + 3
7 = 2 + 5
13 = 2 + 11
19 = 2 + 17
43 = 2 + 41
61 = 2 + 59
151 = 2 + 149
193 = 2 + 191

Other Sums

23 = 2 + 3 + 5 + 13
31 = 7 + 11 + 13
47 = 5 + 19 + 23
59 = 7 + 23 +29
71 = 3 + 31 +37
79 = 13 + 19 +47
79 = 5 + 31 +43
83 = 11 + 31+ 41
101 = 3 + 31 + 67
107 = 19 + 29 +59
109 = 3 + 47+ 59
113 = 11 + 41 +61
127 = 17 + 43 + 67
127 = 2 + 29 + 37 + 59
131 = 41 + 43 + 47
151 = 11 + 67 + 73
157 = 13 + 47 + 97
173 = 43 + 59 + 71
199 = 43 + 47 + 109
223 = 71 + 73 + 79
233 = 59 + 67 + 107
311 = 29 + 47 + 59 + 67 + 109

Primes Composed of a Sum and Product of Primes

31 = 2 * 5 + 7 * 3
43 = 17 + 2 * 13
47 = 2 * 7 + 3 * 11
61 = 2 * 11 + 3 *13
79 = 2 * 7 + 5 * 13
83 = 47 + 2 * (5 + 13)
89 = 7 + 2 * 41
149 = 2 * 17 + 5 * 23
149 = 2 * 59 + 31
163 = 2 + 7 * 23

What other combinations you find?

Eddie

This blog is property of Edward Shore, 2016.