OFFSET
1,1
COMMENTS
In the uploaded table, only 2 instances are primitive friendly: {1488, 270} and {52717500, 2418000}.
LINKS
Michel Marcus, Table of n, a(n) for n = 1..1000
Michel Marcus, The friendly pairs
EXAMPLE
600 is in the sequence, because 600 and 240 belong to A014574 and sigma(600)/600 = sigma(240)/240 = 31/10.
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Aug 31 2012
STATUS
approved