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A037283 Replace n with concatenation of its odd divisors. 5
1, 1, 13, 1, 15, 13, 17, 1, 139, 15, 111, 13, 113, 17, 13515, 1, 117, 139, 119, 15, 13721, 111, 123, 13, 1525, 113, 13927, 17, 129, 13515, 131, 1, 131133, 117, 15735, 139, 137, 119, 131339, 15, 141, 13721, 143, 111, 13591545, 123, 147, 13, 1749, 1525, 131751 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

MATHEMATICA

dtn[ L_ ] := Fold[ 10#1+#2&, 0, L ] Array[ dtn[ Flatten[ Map[ IntegerDigits, Select[ Divisors[ # ], OddQ ] ] ] ]&, 50 ]

cod[n_]:=FromDigits[Flatten[IntegerDigits/@Select[Divisors[n], OddQ]]]; Array[cod, 60] (* Harvey P. Dale, Jan 24 2014 *)

PROG

(Haskell)

a037283 = read . concat . (map show) . a182469_row :: Integer -> Integer

-- Reinhard Zumkeller, May 01 2012]

(Python)

from sympy import divisors

def a(n): return int("".join(str(d) for d in divisors(n) if d%2==1))

print([a(n) for n in range(1, 52)]) # Michael S. Branicky, Dec 31 2020

CROSSREFS

Cf. A182469, A037278, A037284, A037285.

Sequence in context: A013570 A010236 A058018 * A278634 A306507 A094709

Adjacent sequences:  A037280 A037281 A037282 * A037284 A037285 A037286

KEYWORD

nonn,base,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Erich Friedman

STATUS

approved

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Last modified February 24 13:13 EST 2021. Contains 341569 sequences. (Running on oeis4.)