

A037285


Replace n with concatenation of its nontrivial odd divisors.


5



0, 0, 0, 0, 0, 3, 0, 0, 3, 5, 0, 3, 0, 7, 35, 0, 0, 39, 0, 5, 37, 11, 0, 3, 5, 13, 39, 7, 0, 3515, 0, 0, 311, 17, 57, 39, 0, 19, 313, 5, 0, 3721, 0, 11, 35915, 23, 0, 3, 7, 525, 317, 13, 0, 3927, 511, 7, 319, 29, 0, 3515, 0, 31, 37921, 0, 513, 31133, 0, 17, 323, 5735, 0, 39, 0
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,6


LINKS



PROG

(Haskell)
import Data.List (delete)
a037285 n
 a209229 n == 1 = 0
 a010051 n == 1 = 0
 otherwise = read $ concat $ (map show) $ delete n $ tail $ a182469_row n
(Python)
from sympy import divisors
def a(n):
nontrivial_odd_divisors = [d for d in divisors(n)[1:1] if d%2 == 1]
if len(nontrivial_odd_divisors) == 0: return 0
else: return int("".join(str(d) for d in nontrivial_odd_divisors))


CROSSREFS



KEYWORD

nonn,base,easy


AUTHOR



EXTENSIONS



STATUS

approved



