1,2

Complement of set {A(composite number(n)+n)} = {A161537(n)} = {A(A002808(n)+A000027(n))}.

Table of n, a(n) for n=1..50.

Sequence in context: A211264 A189725 A248635 * A225819 A205805 A246372

Adjacent sequences: A171508 A171509 A171510 * A171512 A171513 A171514

nonn

Jaroslav Krizek, Dec 10 2009

approved