A320601 Exponents of powers of two having a digit zero in decimal.

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

Offset: 1

Author

M. F. Hasler, Oct 16 2018

Keywords

• nonn
• base

Comments

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

Examples

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

Crossrefs

Cf. A000079, A007377, A027870, A055641.

Programs

PARI

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

Formula

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