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A259092 Smallest k such that 2^k contains three adjacent copies of n in its decimal expansion. 6
242, 42, 43, 83, 44, 41, 157, 24, 39, 50, 949, 1841, 3661, 1798, 1701, 1161, 1806, 391, 1890, 2053, 950, 1164, 2354, 1807, 3816, 1800, 1799, 818, 1702, 2115, 904, 1798, 1807, 2270, 392, 1699, 3022, 394, 2054, 1758, 1804, 2300, 2720, 2403, 3396, 1133, 1808, 3820 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The multi-digit generalization of A171242. - R. J. Mathar, Jul 06 2015

LINKS

Chai Wah Wu, Table of n, a(n) for n = 0..1000

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

EXAMPLE

2^242 = 7067388259113537318333190002971674063309935587502475832486424805170479104 contains three adjacent 0's.

PROG

(Python)

def A259092(n):

....s, k, k2 = str(n)*3, 0, 1

....while True:

........if s in str(k2):

............return k

........k += 1

........k2 *= 2 # Chai Wah Wu, Jun 18 2015

CROSSREFS

Cf. A006889, A131535, A131536, A259089, A063565, A259091.

Sequence in context: A120377 A321821 A171242 * A060110 A113468 A220089

Adjacent sequences:  A259089 A259090 A259091 * A259093 A259094 A259095

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Jun 18 2015

EXTENSIONS

More terms from Chai Wah Wu, Jun 18 2015

STATUS

approved

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Last modified March 26 21:01 EDT 2019. Contains 321535 sequences. (Running on oeis4.)