A249899 - OEIS

A249899

Numbers k such that sigma(k) contains the same digits as k in base 10.

1, 69, 211, 258, 270, 276, 433, 609, 639, 787, 877, 1021, 1201, 1231, 1255, 1291, 1321, 1433, 1621, 1721, 1787, 1877, 2011, 2111, 2131, 2141, 2161, 2204, 2311, 2391, 2411, 2556, 2676, 2711, 2931, 3121, 3343, 3409, 3413, 3433, 3463, 3554, 3643, 3678, 3679, 3877

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OFFSET

1,2

COMMENTS

Supersequence of A115920 and A069216.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

211 is in the sequence because the set of digits of n {1, 2} equals the set of digits of sigma(211) = 212.

MATHEMATICA

Select[Range[4000], Union[IntegerDigits[DivisorSigma[1, #]]] == Union[ IntegerDigits[#]]&] (* Harvey P. Dale, Dec 29 2015 *)

PROG