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

1, 11, 101, 225, 301, 441, 525, 1003, 1111, 1425, 1521, 1575, 1911, 2015, 2101, 2325, 2475, 2541, 2601, 2925, 3225, 3311, 3825, 4275, 4301, 4851, 5025, 5175, 5445, 5733, 5775, 6075, 6321, 6525, 7315, 7605, 7623, 8325, 8925, 9225, 9555, 10003, 10021

Offset: 1

Author

Asher Auel, Sep 03 2000

Keywords

• nonn
• easy
• base

Links

• Giovanni Resta, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005, A007953, A033950, A057531.

Programs

Mathematica

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