A087502 - OEIS

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A087502

Smallest positive integer which when written in base n is doubled when the last digit is put first.

32, 18, 8, 10993850, 2129428800, 21, 5064320, 105263157894736842, 40, 64609423538, 5712, 65, 58774271029236501660840264682112, 67650, 96, 833, 586081355679130611935159482937228562988190880, 133 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`3,1`
	LINKS	`Table of n, a(n) for n=3..20.`
	EXAMPLE	`a(10)=105263157894736842 because 2*105263157894736842=210526315789473684 and no smaller number has this property.`
	MAPLE	`A087502 := proc(n) local d, a; d := 1; a := n; while a>=n do d := d+1; a := denom((n^d-1)/(2n-1)); od; return(max(2, a)(n^d-1)/(2*n-1)); end proc;`
	CROSSREFS	`See A158877 for these numbers written in base n. Cf. A023094, A034089, A081463, A087502.` `Sequence in context: A033352 A140387 A023094 * A070628 A147514 A070620` `Adjacent sequences: A087499 A087500 A087501 * A087503 A087504 A087505`
	KEYWORD	`nonn,base`
	AUTHOR	`Pontus von Brömssen, Sep 10 2003`
	STATUS	`approved`

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Last modified May 18 09:19 EDT 2013. Contains 225419 sequences.