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A238940 Powers of 4 without the digit '0' in their decimal expansion. 13
1, 4, 16, 64, 256, 16384, 65536, 262144, 16777216, 268435456, 4294967296, 17179869184, 68719476736, 4722366482869645213696, 75557863725914323419136, 77371252455336267181195264 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Conjectured to be finite and complete. See the OEIS wiki page for further information, references and links.

LINKS

Table of n, a(n) for n=1..16.

M. F. Hasler, Zeroless powers, OEIS Wiki, Mar 07 2014

FORMULA

a(n)=4^A030701(n).

PROG

(PARI) for(n=0, 99, vecmin(digits(4^n))&& print1(4^n", "))

CROSSREFS

For the zeroless numbers (powers x^n), see A238938, A238939, A238940, A195948, A238936, A195908, A195946, A195945, A195942, A195943.

For the corresponding exponents, see A007377, A008839, A030700, A030701, A030702, A030703, A030704, A030705, A030706, A195944.

For other related sequences, see A052382, A027870, A102483.

Sequence in context: A075614 A083592 A069029 * A083589 A098590 A270560

Adjacent sequences:  A238937 A238938 A238939 * A238941 A238942 A238943

KEYWORD

nonn,fini,base

AUTHOR

M. F. Hasler, Mar 07 2014

STATUS

approved

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Last modified April 19 21:57 EDT 2021. Contains 343117 sequences. (Running on oeis4.)