OFFSET
1,1
MAPLE
with(numtheory): f := [seq( `if`((sigma(i) > sigma(i+1)), i, print( )), i=1..8000)];
seq( `if`(f[i+1] - f[i] = 4, i, print( )), i=1..3000);
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 10 2000
STATUS
approved