38 +19+1
58 +29+1
88 +11+1
100 +5+1
106 +53+1
160 +5+1
(It’s about this point you start to think you’ll never hit an odd number, let alone a prime number)
166 +83+1
250 +5+1
256 +2+1
(but by landing on a power of 2 we now change parity)
259 +37+1
297 +11+1
309 +103+1
413 +59+1
473 +43+1
517 +47+1
565 +113+1
679 +97+1
777 +37+1
815 +163+1
979 +89+1
1069, which is prime!