1,2

Table of n, a(n) for n=1..18.

a(2) = 4 (4=2*2 has 2 factors and 2 is the largest prime number <= 2) a(3) = 27 (27=3*3*3 has 3 factors and 3 is the largest prime number <= 3) a(4) = 81 (81=3*3*3*3 has 4 factors and 3 is the largest prime number <= 4)

Sequence in context: A266011 A015238 A298987 * A100488 A220019 A225902

Adjacent sequences: A070597 A070598 A070599 * A070601 A070602 A070603

easy,nonn

Jostein Trondal (jallamekk(AT)hotmail.com), May 13 2002

approved