A097372 Numbers n such that n=(d_1+6)*(d_2+6)*...*(d_k+6) where d_1 d_2 ... d_k is the decimal expansion of n.

90, 840, 4320, 59400, 60480, 917280, 2419200, 34992000, 3714984000, 460522782720, 896168448000, 2194698240000, 39109522636800, 229419122688000, 239446056960000, 650997662515200, 3954407288832000, 182279345504256000, 883270791696384000, 275333274192936960000

Offset

1,1

Links

Hiroaki Yamanouchi and Max Alekseyev, Table of n, a(n) for n = 1..29 (contains all terms below 10^100)

Example

90 is in the sequence because 90 = (9+6)*(0+6).

Mathematica

Do[h=IntegerDigits[n]; l=Length[h]; If[n==Product[h[[k]]+6, {k, l}], Print[n]], {n, 130000000}]

Crossrefs

Cf. A097371, A098681, A098682.

Cf. A098113, A098114, A097371, A115227.

Sequence in context: A051695 A304165 A232588 * A263170 A321303 A376706

Adjacent sequences: A097369 A097370 A097371 * A097373 A097374 A097375

Keyword

base,nonn

Author

Farideh Firoozbakht, Sep 21 2004

Extensions

More terms from Giovanni Resta, Jan 16 2006

a(19)-a(24) from Hiroaki Yamanouchi, Sep 08 2014

a(25)-a(29) from Max Alekseyev, Jan 25 2015

Status

approved