A020767 Product_{k=1..n} b(k), where b(k) = binary expansion of k (A007088) but read as if it were a decimal number.

1, 1, 10, 110, 11000, 1111000, 122210000, 13565310000, 13565310000000, 13578875310000000, 13714664063100000000, 13865525367794100000000, 15252077904573510000000000, 16792537772935434510000000000, 18639716927958332306100000000000, 20708725506961707192077100000000000

Offset: 0

Author

Susanna Cuyler, May 23 2003

Keywords

• nonn
• base
• easy

Examples

			a(4) = 1*10*11*100 = 11000.
		

Crossrefs

Partial products of A007088.