id:A116438 - OEIS Search Results

Search: id:A116438

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Numbers n which when sandwiched between two 3's give a multiple of n.

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1, 3, 11, 13, 21, 33, 39, 77, 91, 137, 219, 411, 9091, 29703, 909091, 5882353, 10989011, 12145749, 12987013, 14354067, 20979021, 22556391, 32967033, 38961039, 52631579, 76923077, 90909091, 297029703, 1185770751, 2479338843 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`219 belongs since 32193 is a multiple of 219 (219*147).`
	MATHEMATICA	`f[k_, d_] := Flatten@Table[Select[Divisors[k(10^(i + 1) + 1)], IntegerLength[ # ] == i &], {i, d}]; f[3, 10] (Chandler*)`
	CROSSREFS	`Cf. A116436-A116444.` `Sequence in context: A067386 A063621 A066594 this_sequence A117682 A045429 A019374` `Adjacent sequences: A116435 A116436 A116437 this_sequence A116439 A116440 A116441`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 15 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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