1,1

No other terms below 10^7.

Composites smaller than 23 are 4,6,8,9,10,12,14,15,16,18,20,21 and 22. 23 is congruent to 3,5,7,5,3,11,9,8,7,5,3 and 2 modulo these numbers respectively. The sum of these residues is 69. This is a multiple of 23, so 23 is in the sequence.

Cf. A143851

Sequence in context: A032003 A031907 A082244 this_sequence A141047 A003531 A121984

Adjacent sequences: A143850 A143851 A143852 this_sequence A143854 A143855 A143856

more,nonn

N. Fernandez (ncf(AT)borve.org), Sep 03 2008

490537 from Max Alekseyev (maxale(AT)gmail.com), Sep 15 2009