A053337 - OEIS

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A053337

a(n) contains n digits (either '6' or '7') and is divisible by 2^n.

6, 76, 776, 7776, 67776, 667776, 6667776, 66667776, 766667776, 6766667776, 66766667776, 666766667776, 7666766667776, 77666766667776, 777666766667776, 7777666766667776, 77777666766667776, 777777666766667776 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n)=a(n-1)+10^(n-1)*(6+[a(n-1)/2^(n-1) mod 2]) i.e. a(n) ends with a(n-1); if (n-1)-th term is divisible by 2^n then n-th term begins with a 6, if not then n-th term begins with a 7.`
	CROSSREFS	`Cf. A023409, A050621, A050622, A035014.` `Sequence in context: A016090 A181343 A137132 * A199026 A155643 A066797` `Adjacent sequences: A053334 A053335 A053336 * A053338 A053339 A053340`
	KEYWORD	`base,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Mar 06 2000`

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Last modified February 15 09:42 EST 2012. Contains 205756 sequences.