75
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37
19 23 29 31 37 41 43 47 53 59
next prime number after 31 = 37
It is: 37
These are numbers where after the second number each one is the sum of the previous two. So then you have 23+37 = 60, then 37+60 etc. Eventually you get a series where successive terms are in the same ratio as for the Fibonacci series.