id:A053696 - OEIS Search Results

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Numbers which can be represented as a string of three or more 1's in a base >=2.

+0
3

7, 13, 15, 21, 31, 40, 43, 57, 63, 73, 85, 91, 111, 121, 127, 133, 156, 157, 183, 211, 241, 255, 259, 273, 307, 341, 343, 364, 381, 400, 421, 463, 507, 511, 553, 585, 601, 651, 703, 757, 781, 813, 820, 871, 931, 993, 1023, 1057, 1093, 1111, 1123, 1191 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Numbers of the form (b^n-1)/(b-1) for n>2 and b>1. - T. D. Noe (noe(AT)sspectra.com), Jun 07 2006`
	LINKS	`T. D. Noe, Table of n, a(n) for n = 1..1172`
	EXAMPLE	`a(5)=31 because 31 can be written as 111 base 5 (or indeed 11111 base 2)`
	CROSSREFS	`Cf. A119598 (numbers that are repunits in four or more bases).` `Sequence in context: A135054 A076701 A076196 this_sequence A090503 A059520 A102797` `Adjacent sequences: A053693 A053694 A053695 this_sequence A053697 A053698 A053699`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Mar 23 2000`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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