A121610 Composite numbers that can be written as concatenation of two composite numbers in decimal representation.

44, 46, 48, 49, 64, 66, 68, 69, 84, 86, 88, 94, 96, 98, 99, 104, 106, 108, 124, 126, 128, 129, 144, 146, 148, 154, 156, 158, 159, 164, 166, 168, 169, 184, 186, 188, 189, 204, 206, 208, 209, 214, 216, 218, 219, 224, 226, 228, 244, 246, 248, 249, 254, 256, 258

Offset: 1

Author

Reinhard Zumkeller, Aug 10 2006

Keywords

• nonn
• base

Examples

			A002808(328) = 408 = 40*10+8 = A002808(27)*10+A002808(3),
therefore 408 is a term: a(99) = 408;
A002808(331) = 412 = 4*100+12 = A002808(1)*100+A002808(6),
therefore 412 is a term: a(100) = 412.
		

Crossrefs

Cf. A121609, A105184, A121608.