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From one number to the next you add one to each addition... 1 to 5= +4 5 to 13= +8 (+ 4 from last) 13 to 26= +13 (+ 5 from last) 26 to 45= +19 (+ 6 from last) 45 to 71= +26 (+ 7 from last)

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16y ago

What else can I help you with?