A083889 - OEIS

This site is supported by donations to The OEIS Foundation.

A083889

Number of divisors of n with largest digit = 2 (base 10).

0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 3, 0, 1, 1, 1, 0, 2, 0, 1, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 2, 0, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,12`
	COMMENTS	`a(n) = A000005(n) - A083888(n) - A083890(n) - A083891(n) - A083892(n) - A083893(n) - A083894(n) - A083895(n) - A083896(n) = A083897(n) - A083888(n).`
	EXAMPLE	`n=120, 4 of the 16 divisors of 120 have largest digit =2:` `{2,12,20,120}, therefore a(120)=4.`
	CROSSREFS	`Cf. A054055, A000005, A083897.` `Sequence in context: A104975 A191254 A106404 * A127523 A116927 A137276` `Adjacent sequences: A083886 A083887 A083888 * A083890 A083891 A083892`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 08 2003`

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

Last modified February 17 10:05 EST 2012. Contains 206009 sequences.