1972 = 2 * 2 * 17 * 29, PR#2-2-17-29 = 13-13-73-139
131373139 = 9871 × 13309, 13+13+73+139 = 238 = 2 × 119.
PR#1972 = 17077, 7*7*17 = 833, 17+7+7 = 31.
PR#19 - 72 = 83 - 383, 83383 -PR,
83*383 = 31789, 83+383 = 466 = 2 × 233.
PR#1,9,7,2 - 11-41-31-13
11413113 = 3 × 113 × 131 × 257 = 113 * 101001,
11+41+31+13 = 96 = 32 × 3,
1141+3113 = 4254 = 2 × 3 × 709,
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