1,1

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

a(n) = A001358(n) + A106554(n). - Reinhard Zumkeller, May 19 2005

First semiprime is 4; 4 is 2*2; 26=4+22.

Second semiprime is 6; 6 is 2*3; 29=6+23.

Third semiprime is 9; 9 is 3*3; 41=9+33.

Fourth semiprime is 10; 10 is 2*5; 35=10+25.

Cf. A084126, A084127, A001358.

Sequence in context: A256619 A055109 A106552 * A304949 A316617 A303815

Adjacent sequences: A106547 A106548 A106549 * A106551 A106552 A106553

base,easy,nonn

Eric Angelini, May 09 2005

More terms from Reinhard Zumkeller, May 19 2005

approved