_:b7227579 "(computing, mathematics) Based on the number 15; using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E."@en . . _:b7227580 "Kleene [13] uses a similar approach, based on Turing machine encodings over an alphabet of fifteen symbols, which are then translated into pentadecimal numbers."@en . _:b7227580 "1980 April, Norman H Cohen, \u201CG\u00F6del numbers: a new approach to structured programming\u201D, in ACM SIGPLAN Notices:"@en . . _:b7227579 . _:b7227580 . "1" . .