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A103662 Smallest power with base>1 and exponent n whose decimal representation doesn't contain the digit 0. 11

%I

%S 1,2,4,8,16,32,64,128,256,512,9765625,177147,531441,8192,16384,32768,

%T 65536,17179869184,262144,524288,3833759992447475122176,

%U 1582794342217312156827221746448942623537121214738891981,341427877364219557396646723584,94143178827,16777216

%N Smallest power with base>1 and exponent n whose decimal representation doesn't contain the digit 0.

%C For statistical reasons it is conjectured that the sequence is finite.

%C a(40), if it exists, is not known.

%C From _M. F. Hasler_, Mar 08 2014 (Start):

%C Finite means here that for some n, no such power > 1 exists. This might be the case already for n=40. Alternatively, the sequence might be defined for all n by letting a(n)=1 if no larger power exists. Then a(n)=n^A103663(n) for all n.

%C Differs from A238938 from n=10 on. See the OEIS wiki page for further information. (End)

%H Michel Marcus, <a href="/A103662/b103662.txt">Table of n, a(n) for n = 0..39</a>

%H M. F. Hasler, <a href="https://oeis.org/wiki/Zeroless_powers">Zeroless powers</a>, OEIS wiki, Mar 07 2014

%F a(n) = A103663(n)^n. - _M. F. Hasler_, Mar 08 2014

%e base / exponent n / base^exponent

%e 2 1 2

%e 2 2 4

%e 2 3 8

%e 2 4 16

%e 2 5 32

%e 2 6 64

%e 2 7 128

%e 2 8 256

%e 2 9 512

%e 5 10 9765625

%e 3 11 177147

%e 3 12 531441

%e 2 13 8192

%e 2 14 16384

%e 2 15 32768

%e 2 16 65536

%e 4 17 17179869184

%e 2 18 262144

%e 2 19 524288

%e 12 20 3833759992447475122176

%e 381 21 1582794342217312156827221746448942623537121214738891981

%e 22 22 341427877364219557396646723584

%e 3 23 94143178827

%e ...

%e a(10)=9765625 because 5^10 is the smallest 10th power containing no zero in its decimal representation (2^10=1024, 3^10=59049, 4^10=1048576).

%o (PARI) A103662(n)=for(b=2,9e9,vecmin(digits(b^n))&&return(b^n)) \\ _M. F. Hasler_, Mar 08 2014

%Y Cf. A103663 = smallest bases x such that x^n has a zero-less decimal representation.

%K nonn,fini,base

%O 0,2

%A _Hugo Pfoertner_, Feb 28 2005

%E a(21)=381^21 found by _Joshua Zucker_.

%E Edited by _Charles R Greathouse IV_, Aug 03 2010

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Last modified May 12 21:43 EDT 2021. Contains 343829 sequences. (Running on oeis4.)