id:A106662 - OEIS Search Results

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Smallest semiprime ending in exactly n 7's.

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57, 77, 3777, 17777, 277777, 1777777, 17777777, 877777777, 3777777777, 17777777777, 577777777777, 1777777777777, 37777777777777, 877777777777777, 4777777777777777, 37777777777777777, 277777777777777777 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(3)=3777 is a term because 3777 is the smallest semiprime ending in exactly three 7's.`
	CROSSREFS	`Sequence in context: A043252 A044032 A104760 this_sequence A087922 A087921 A086097` `Adjacent sequences: A106659 A106660 A106661 this_sequence A106663 A106664 A106665`
	KEYWORD	`base,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), May 12 2005`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research