OFFSET
1,2
FORMULA
Least solution to Min{x; phi[x+n]=sigma[x]}.
EXAMPLE
n=6:a[6]=19 because sigma[19]=20=phi[19+6]=phi[25]=20.
n=16:a[16]=23 because sigma[23]=24=phi[23+16]=phi[39]=24
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, May 11 2004
STATUS
approved