id:A116442 - OEIS Search Results

Search: id:A116442

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Numbers n which when sandwiched between two 7's give a multiple of n.

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1, 7, 11, 13, 49, 77, 91, 137, 511, 959, 9091, 69307, 909091, 5882353, 10989011, 12987013, 28340081, 33492823, 48951049, 52631579, 76923077, 90909091, 693069307, 2766798419, 4347826087, 5785123967, 9090909091, 13698630137 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`511 belongs since 75117 is a multiple 511 (511*147).`
	MATHEMATICA	`f[k_, d_] := Flatten@Table[Select[Divisors[k(10^(i + 1) + 1)], IntegerLength[ # ] == i &], {i, d}]; f[7, 11] (Chandler*)`
	CROSSREFS	`Cf. A116436-A116444.` `Adjacent sequences: A116439 A116440 A116441 this_sequence A116443 A116444 A116445` `Sequence in context: A084457 A045460 A054299 this_sequence A062607 A018768 A045970`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 15 2006`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

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