OFFSET

0,3

LINKS

Popular Computing (Calabasas, CA), Two Tables, Vol. 1, (No. 9, Dec 1973), page PC9-16.

EXAMPLE

a(3)=43 because 2^43 (i.e. 8796093022208) is the smallest power of 2 to contain a run of 3 consecutive twos in its decimal form.

MATHEMATICA

Table[k = 0; While[! SequenceCount[IntegerDigits[2^k], ConstantArray[2, n]] > 0, k++]; k, {n, 10}] (* Robert Price, May 17 2019 *)

PROG

(Python)

def A259089(n):

s, k, k2 = '2'*n, 0, 1

while True:

if s in str(k2):

return k

k += 1

k2 *= 2 # Chai Wah Wu, Jun 19 2015

CROSSREFS

KEYWORD

more,nonn,base

AUTHOR

N. J. A. Sloane, Jun 18 2015

EXTENSIONS

a(7)-a(13) from Chai Wah Wu, Jun 20 2015

Definition corrected by Manfred Scheucher, Jun 23 2015

a(0) prepended by Chai Wah Wu, Jan 28 2020

STATUS

approved