Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 Dec 25 2021 18:35:23
%S 3,42,75,132,165,222,255,312,345,411,435,501,525,591,615,681,714,771,
%T 804,861,894,951,984,1032,1065,1122,1155,1212,1245,1311,1335,1401,
%U 1425,1491,1515,1581,1614,1671,1704,1761,1794,1851,1884,1941,1974,2022,2055,2112,2145
%N Self-numbers (A003052) that are multiples of 3 but not of 9.
%D D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately printed, 311 Devlali Camp, Devlali, India, 1963.
%H Reinhard Zumkeller, <a href="/A249046/b249046.txt">Table of n, a(n) for n = 1..1000</a>
%H D. R. Kaprekar, <a href="/A003052/a003052_2.pdf">The Mathematics of the New Self Numbers</a> [annotated and scanned]
%o (Haskell)
%o a249046 n = a249046_list !! (n-1)
%o a249046_list = filter ((> 0) . flip mod 9) a249045_list
%o -- _Reinhard Zumkeller_, Oct 31 2014
%Y Cf. A003052, A249045-A249048.
%K nonn,base
%O 1,1
%A _N. J. A. Sloane_, Oct 30 2014