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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. 7

%I #24 Jan 25 2015 19:27:02

%S 90,840,4320,59400,60480,917280,2419200,34992000,3714984000,

%T 460522782720,896168448000,2194698240000,39109522636800,

%U 229419122688000,239446056960000,650997662515200,3954407288832000,182279345504256000,883270791696384000,275333274192936960000

%N 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.

%H Hiroaki Yamanouchi and Max Alekseyev, <a href="/A097372/b097372.txt">Table of n, a(n) for n = 1..29</a> (contains all terms below 10^100)

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

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

%Y Cf. A097371, A098681, A098682.

%Y Cf. A098113, A098114, A097371, A115227.

%K base,nonn

%O 1,1

%A _Farideh Firoozbakht_, Sep 21 2004

%E More terms from _Giovanni Resta_, Jan 16 2006

%E a(19)-a(24) from _Hiroaki Yamanouchi_, Sep 08 2014

%E a(25)-a(29) from _Max Alekseyev_, Jan 25 2015

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)