A131548 Least power of 3 having a run of exactly n consecutive 5's in its decimal representation.

8, 27, 33, 33, 274, 2076, 5173, 8880, 67390, 206131, 864271, 1291676, 5756979, 13654248, 73000220

Offset: 1

Author

Shyam Sunder Gupta, Aug 26 2007

Keywords

• more
• nonn
• base

Examples

			a(3) = 33 because 3^33 = 5559060566555523 is the smallest power of 3 that contains a run of exactly 3 consecutive 5's in its decimal form. (3^33 happens to contain also a run of exactly 4 consecutive 5's, so a(4) is also 33.)
		

Crossrefs

Cf. A195269, A131552, A131551, A131550, A131549, A131547, A131546, A131545, A131544.

Extensions

a(11)-a(14) from Lars Blomberg, Feb 02 2013

a(15) from Bert Dobbelaere, Mar 05 2019

a(3) corrected by Pontus von Brömssen, Jul 21 2024