A046430 - OEIS

This site is supported by donations to The OEIS Foundation.

A046430

All the prime factors of repunit a(n) end with the digit 1.

1, 2, 4, 5, 10, 19, 20, 23, 25, 38, 50, 59, 76, 95, 100 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`P. De Geest, Repunits prime factors` `Eric Weisstein's World of Mathematics, Repunit`
	EXAMPLE	`a(n)=10 -> 11412719091 ->1(1)4(1)27(1)909(1).`
	CROSSREFS	`Cf. A000042, A004022, A046053.` `Sequence in context: A018401 A049332 A096570 * A133040 A018424 A000675` `Adjacent sequences: A046427 A046428 A046429 * A046431 A046432 A046433`
	KEYWORD	`nonn,more,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1998.`

Content is available under The OEIS End-User License Agreement .

Last modified February 16 14:07 EST 2012. Contains 205930 sequences.