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A320601 Exponents of powers of two having a digit zero in decimal. 1
10, 11, 12, 17, 20, 21, 22, 23, 26, 29, 30, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 73, 74, 75, 78, 79, 80, 82, 83, 84, 85, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A007377. It is a long-standing open problem to show that this sequence contains all numbers > 86.

LINKS

Table of n, a(n) for n=1..70.

FORMULA

{ n | A027870(n) > 0}, where A027870 = A055641 o A000079.

EXAMPLE

The first term is a(1) = 10 since 2^10 = 1024 is the smallest power of 2 having a digit 0.

PROG

(PARI) for(n=1, 199, vecmin(digits(2^n))||print1(n", "))

CROSSREFS

Cf. A000079, A007377, A027870, A055641.

Sequence in context: A258744 A219251 A154770 * A305130 A098395 A207968

Adjacent sequences:  A320598 A320599 A320600 * A320602 A320603 A320604

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, Oct 16 2018

STATUS

approved

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Last modified April 22 22:19 EDT 2021. Contains 343197 sequences. (Running on oeis4.)