1,1

Table of n, a(n) for n=1..56.

15 is in the list because (1+5)/2=3 and 3 is a prime factor of 15.

Cf. A027746, A175688.

Sequence in context: A303875 A228652 A157833 * A151531 A079987 A085547

Adjacent sequences: A175755 A175756 A175757 * A175759 A175760 A175761

nonn,base

Juri-Stepan Gerasimov, Aug 28 2010, Aug 29 2010

399 inserted by D. S. McNeil, Sep 27 2010

approved