id:A116439 - OEIS Search Results

Search: id:A116439

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Numbers n which when sandwiched between two 4's give a multiple of n.

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1, 2, 4, 11, 13, 14, 22, 26, 28, 44, 52, 77, 91, 137, 146, 274, 292, 548, 9091, 19802, 39604, 909091, 5882353, 10989011, 12987013, 13986014, 15037594, 16194332, 19138756, 21978022, 25974026, 27972028, 30075188, 43956044, 51948052 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`91 belongs since 4914 is a multiple of 91 (91*54).`
	MATHEMATICA	`f[k_, d_] := Flatten@Table[Select[Divisors[k(10^(i + 1) + 1)], IntegerLength[ # ] == i &], {i, d}]; f[4, 9] (Chandler*)`
	CROSSREFS	`Cf. A116436-A116444.` `Sequence in context: A136992 A089694 A071069 this_sequence A018525 A102935 A038193` `Adjacent sequences: A116436 A116437 A116438 this_sequence A116440 A116441 A116442`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 15 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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