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A057532 n is odd and sum of digits of n equals the numbers of divisors of n. 8


%S 1,11,101,225,301,441,525,1003,1111,1425,1521,1575,1911,2015,2101,

%T 2325,2475,2541,2601,2925,3225,3311,3825,4275,4301,4851,5025,5175,

%U 5445,5733,5775,6075,6321,6525,7315,7605,7623,8325,8925,9225,9555,10003,10021

%N n is odd and sum of digits of n equals the numbers of divisors of n.

%H Giovanni Resta, <a href="/A057532/b057532.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[1, 10^4, 2], Plus @@ IntegerDigits[#] == DivisorSigma[0, #] &] (* _Giovanni Resta_, Apr 24 2017 *)

%Y Cf. A000005, A007953, A033950, A057531.

%K nonn,easy,base

%O 1,2

%A Asher Auel (asher.auel(AT)reed.edu), Sep 03 2000

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Last modified November 29 08:38 EST 2020. Contains 338762 sequences. (Running on oeis4.)