A121994 Smallest natural number that yields a sequence of n decreasing numbers under the "Look and Say" operator A045918.

1, 33, 333, 333111, 33333333333333333333333333333333311111111111

Offset: 0

Author

Sergio Pimentel, Sep 11 2006

Keywords

• hard
• more
• nonn
• base

Comments

a(5) <= 33333333333333333333333333333333 '3's concatenated with 1111111111 '1's. - Tyler Busby, Feb 07 2023

Examples

			a(3)=333111 because under the Look and Say operator sequence A045918 it yields: 3331, 3311, 2321 which are all decreasing (3 in a row). The next term would be 12131211 which is greater than 2321.
		

Links

• Eric Weisstein's World of Mathematics, Look and Say.

Crossrefs

Cf. A045918, A005150, A005341, A023989, A079475.

Extensions

a(4) from Sergio Pimentel, Mar 05 2008

a(4) corrected by Tyler Busby, Feb 07 2023