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A097371 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. 6
50, 210, 450, 780, 1500, 3920, 16500, 91728, 269500, 493920, 1293600, 266378112, 317447424, 1277337600, 14948388000, 48697248600, 379748636467200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are even.

No other terms below 10^100. - Max Alekseyev, Jan 26 2015

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

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).

MATHEMATICA

Do[h=IntegerDigits[n]; l=Length[h]; If[n==Product[h[[k]]+5, {k, l}], Print[n]], {n, 800000000}]

CROSSREFS

Cf. A097372, A098681.

Sequence in context: A173141 A115592 A273293 * A179755 A186843 A250527

Adjacent sequences:  A097368 A097369 A097370 * A097372 A097373 A097374

KEYWORD

base,nonn

AUTHOR

Farideh Firoozbakht, Sep 20 2004

EXTENSIONS

4 more terms from Giovanni Resta, Jan 13 2006

STATUS

approved

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Last modified October 23 17:32 EDT 2019. Contains 328373 sequences. (Running on oeis4.)