This lists the preferred numbers in the four principal series, R5, R10, R20 and R40, as well as the additional R80 series for special applications and gives information regarding their derivation, together with definitions of the terms used. These are agreed internationally by the International Organization for Standardization in New York, June 1952, and published as ISO Recommendation No. 3. Examples of the use of preferred numbers and recommendations for calculating them are given.

ISO 497 : 1973(R2008) - Identical

ISO 17 : 1973(R2008) - Identical

ISO 3 : 1973(R2008) - Identical

ISO 3 : 1973(R2008) - Identical

ISO 17 : 1973(R2008) - Identical

ISO 497 : 1973(R2008) - Identical