A079323 First number in a sequence of 4 consecutive economical numbers.

179210312, 10189653632, 11306629375, 12372501247, 12450928125, 16064890623, 100911346046, 102029981184, 103029727742, 103538511872, 103852693375, 105264783872, 107943730622, 112167589373, 114281242494, 115827546751

Offset: 1

Author

Sudipta Das (juitech(AT)vsnl.net), Feb 12 2003

Keywords

• hard
• nonn
• base

Examples

			a(2) = 10189653632 because 10189653632 ( = 2^7 * 79606669), 10189653633 ( = 3^6 * 733 * 19069), 10189653634 ( = 2 * 227^2 * 98873), 10189653635 ( = 5 * 7^3 * 5941489) form a sequence of 4 consecutive economical numbers.
		

Links

• J.-M. De Koninck and F. Luca, On strings of consecutive economical numbers of arbitrary length
• Eric Weisstein's World of Mathematics, Economical Number

Crossrefs

Cf. A047738.

Extensions

a(7)-a(16) from Donovan Johnson, Apr 14 2010