1,1

Table of n, a(n) for n=1..71.

a(1)=3 because sum of aliquot divisors of first semiprime i.e. 4 is 1+2=3.

Sequence in context: A154890 A248176 A100000 * A021278 A143940 A321773

Adjacent sequences: A083679 A083680 A083681 * A083683 A083684 A083685

easy,nonn

Shyam Sunder Gupta, Jun 15 2003

approved