1,4

Table of n, a(n) for n=1..53.

y(5)=300 since A181643(5)=40 and 40*(40+5)*(40+5+5)=40*45*50=90000=300*300

Cf. A115878, A181643.

Sequence in context: A160484 A271986 A091028 * A262137 A096511 A116346

Adjacent sequences: A181643 A181644 A181645 * A181647 A181648 A181649

nonn

Carmine Suriano, Nov 03 2010, corrected Nov 10 2010

approved