A047738 Earliest sequence of 4 consecutive economical numbers.

179210312, 179210313, 179210314, 179210315

Offset: 1

Author

Carlos Rivera

Keywords

• fini
• full
• nonn
• base

Examples

			179210312 = 2^3* 4733^2; 9 digits in 179219312, 7 digits in its prime factorization, 7 < 9, so that number is economical.
		

Links

• Tanya Khovanova, Non Recursions
• J.-M. De Koninck and F. Luca, On strings of consecutive economical numbers of arbitrary length, Integers: Electronic Journal of Combinatorial Number Theory 5, (2005), #A5.
• Eric Weisstein's World of Mathematics, Economical Number

Crossrefs

Cf. A046759.