OFFSET
1,2
COMMENTS
Pairs of consecutive 1's occur uncommonly often in A053230.
MAPLE
with(numtheory): f := [seq( `if`((sigma(i+1) > sigma(i)), i, print( )), i=1..5000)];
seq(`if`((f[i+2]-f[i+1]=1) and (f[i+1]-f[i]=1), i, print( )), i=1..1500);
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 10 2000
STATUS
approved