Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 513: | \[{20^{513}-1\over19}\] | 19 × 229 × 421 × 666901 × 64008001 × 879338701 × 75368484119<11> × 192696104561<12> × 1374892397251<13> × 298114935351301<15> × 207373637974370334920244263016739<33> × 187264653764095586664819173388580537613342284054996019397698915269<66> × 1732724154386392878105444638522339285040431386224361108901067218292376986829<76> × [51245676006885297403134526501891569603216925593811596248880935453855310372409282431067763456210302601778757830619331333931350555565598387159836040901041381206363968632514453224791712632497520425385049008916887790996940581432622304966604380476163016034961114267111122865729122239820117832242990405160196315169172360990668145257099680986251846640847686782953677546565358276565684082829781533117701128053489198545943101<416>] |