OFFSET
1,1
COMMENTS
Pairs of consecutive 1's occur uncommonly often in A053238.
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
MAPLE
with(numtheory): f := [seq( `if`((sigma(i) > sigma(i+1)), 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);
PROG
(Haskell)
a053245 n = a053245_list !! (n-1)
a053245_list = f a053242_list where
f (x:x':xs) | x' == x+1 = x : f xs
| otherwise = f (x':xs)
-- Reinhard Zumkeller, Oct 16 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 10 2000
STATUS
approved