Those damn prime numbers.

This upsets me.

The first 22 primes:
2 3 5 7 11 13 17 19 23 29 31 37
41 43 47 53 59 61 67 71 73 79

Sums of the first primes.
They seem to follow a rule that
they alternate between a sum that
is a prime number, or a sum that
is one less than a prime number.

Then it all falls apart at 19.

PRIME 2+3= 5
PRIME-1 2+3+5= 10= 11-1
PRIME 2+3+5+7= 17
PRIME-1 2+3+5+7+11= 28= 29-1
PRIME 2+3+5+7+11+13= 41
PRIME-1 2+3+5+7+11+13+17= 58= 59-1
7 X 11 2+3+5+7+11+13+17+19= 77