id:A077805 - OEIS Search Results

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Smallest prime factor of numbers containing in their decimal representation only the digits 0 and 1.

+0
3

1, 2, 11, 2, 101, 2, 3, 2, 7, 2, 3, 2, 3, 2, 11, 2, 73, 2, 3, 2, 3, 2, 10111, 2, 3, 2, 7, 2, 17, 2, 41, 2, 11, 2, 3, 2, 3, 2, 11, 2, 3, 2, 83, 2, 7, 2, 101111, 2, 3, 2, 11, 2, 23, 2, 149, 2, 11, 2, 31, 2, 241, 2, 3, 2, 101, 2, 3, 2, 3, 2, 7, 2, 3, 2, 11, 2, 971, 2, 181, 2, 3, 2, 31, 2, 73, 2 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = A020639(A007088(n)).`
	EXAMPLE	`a(45) = A020639(A007088(45)) = A020639(101101) = A020639(71113*101) = 7.`
	CROSSREFS	`Cf. A077806, A020449.` `Sequence in context: A053994 A057213 A037299 this_sequence A104662 A121713 A134242` `Adjacent sequences: A077802 A077803 A077804 this_sequence A077806 A077807 A077808`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Nov 16 2002`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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