%I #14 Dec 25 2021 18:35:23
%S 42,48,60,66,78,93,105,111,114,120,123,129,141,147,159,174,186,201,
%T 204,210,213,219,231,237,249,264,276,291,303,309,321,327,339,354,366,
%U 381,393,408,420,426,438,453,465,480,492,507,519,534,546,561,573,588,609,624,636
%N a(1) = 42; a(n+1) = a(n) + sum of decimal digits of a(n).
%D D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately Printed, 311 Devlali Camp, Devlali, India, 1963.
%H Reinhard Zumkeller, <a href="/A249043/b249043.txt">Table of n, a(n) for n = 1..10000</a>
%H D. R. Kaprekar, <a href="/A003052/a003052_2.pdf">The Mathematics of the New Self Numbers</a> [annotated and scanned]
%H <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a>
%F a(n+1) = A062028(a(n)). - _Reinhard Zumkeller_, Oct 31 2014
%o (Haskell)
%o a249043 n = a249043_list !! (n-1)
%o a249043_list = iterate a062028 42
%o -- _Reinhard Zumkeller_, Oct 31 2014
%Y Cf. A004207, A016052, A007618, A006507, A016052, A036228.
%Y Cf. A007953, A062028.
%K easy,nonn,base
%O 1,1
%A _N. J. A. Sloane_, Oct 30 2014