using for variable as rowname

Is there a way to use the cycle variable for rowname?

v=1:6
for (a in 1:3){
 for  (b in 4:5) {
  v=rbind(v,a.b=1)
 }
}
v

This above obviously does not work, but I couldn't find out how to use a and
b to construct a rowname like 14, 15, 24, 25.
Thanks for the help.
Balazs

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