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Search: id:A097371
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| A097371 |
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Numbers n such that n=(d_1+5)(d_2+5)*...*(d_k+5) where d_1 d_2 ... d_k is the decimal expansion of n. |
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+0
6
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| 50, 210, 450, 780, 1500, 3920, 16500, 91728, 269500, 493920, 1293600, 266378112, 317447424, 1277337600, 14948388000, 48697248600, 379748636467200
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OFFSET
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1,1
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COMMENT
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All terms are even.
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EXAMPLE
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317447424 is in the sequence because 317447424=(3+5)(1+5)(7+5)(4+5)(4+5)(7+5)(4+5)(2+5)(4+5).
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MATHEMATICA
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Do[h=IntegerDigits[n]; l=Length[h]; If[n==Product[h[[k]]+5, {k, l}], Print[n]], {n, 800000000}]
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CROSSREFS
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Cf. A097372, A098681.
Sequence in context: A048511 A031692 A115592 this_sequence A091883 A091414 A046656
Adjacent sequences: A097368 A097369 A097370 this_sequence A097372 A097373 A097374
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KEYWORD
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base,nonn
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AUTHOR
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Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Sep 20 2004
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EXTENSIONS
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4 more terms from Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 13 2006
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