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

1,1

Links

Table of n, a(n) for n=1..55.

Example

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.

Sequence in context: A364657 A254750 A225619 * A254752 A178755 A182261

Adjacent sequences: A121607 A121608 A121609 * A121611 A121612 A121613

Keyword

nonn,base

Author

Reinhard Zumkeller, Aug 10 2006

Status

approved