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 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 Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 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 -- Reinhard Zumkeller, May 01 2012 (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)) print([a(n) for n in range(1, 70)]) # Michael S. Branicky, Dec 31 2020 CROSSREFS Cf. A182469, A209229, A010051, A106708, A037283, A037284. Sequence in context: A222402 A222522 A091921 * A337981 A341761 A181787 Adjacent sequences: A037282 A037283 A037284 * A037286 A037287 A037288 KEYWORD nonn,base,easy AUTHOR N. J. A. Sloane EXTENSIONS More terms from Erich Friedman STATUS approved

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Last modified June 17 19:57 EDT 2024. Contains 373463 sequences. (Running on oeis4.)