A grafting number, in the original decimal square root convention, is a nonnegative integer whose digits appear as a consecutive block in the decimal expansion of its square root, starting either in the integer part or immediately after the decimal point (Numberphile 2012; Tanniru 2015, pp. 309-310). The decimal point is ignored when matching the block. For example,
 |
whose first two digits reproduce 98 across the decimal point. Similarly, 
begins its fractional part with 77, while 
contains 764
beginning at the units place.
Tanniru (2015, p. 309) calls these integers grafting integers and uses grafting numbers for a broader construction involving real numbers, other nth roots, and other number bases. This distinction matters when comparing the original integer examples with the generalized terminology.
