A116064 Powerful numbers (A001694) made of nontrivial runs of identical digits.

7744, 665500, 774400, 5556600, 6655000, 7744000, 55566000, 66550000, 77440000, 447722888, 448855888, 555660000, 665500000, 774400000, 1155775544, 5500002244, 5511005500, 5556600000, 6655000000, 7744000000, 11000004488, 11122233444, 22244466888

Offset: 1

Author

Giovanni Resta, Feb 13 2006

Keywords

• nonn
• base

Comments

A run of length 1 is trivial.

Examples

			448855888 = 2^4*13^3*113^2.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..201 (terms below 10^18)
• Index entries for sequences related to powerful numbers.

Crossrefs

Intersection of A001694 and A033023.

Extensions

a(16)-a(23) from Donovan Johnson, Jun 29 2011