Bones
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Napier's Bones, a system similar to an abacus which assists in the calculation of products and quotients, and also referred to as Rabdology, was first mentioned as a new invention by Napier in 1617 in Edinburgh, Scotland.
John Napier (1550 - 4 April 1617) was a Scottish mathematician, physicist, astronomer, and astrologer. He is known as the inventor of logarithms, Napier's bones, and made using the decimal point popular.
John Napier's birthday is not known. However, records at the University of St. Andrews in Scotland affirm he was a student there. We choose to honor him on St. Andrew's Day, November 30.John Napier (1550 - 1617)
The nearest ten of 1617 would be 1620.
The GCF is 147.