cp's OEIS Frontend

A227048 Irregular triangle read by rows: row n, for n >= 0, lists the nonnegative differences 3^n - 2^m, m >= 0, in increasing order.

%I A227048 #16 Oct 13 2019 14:07:16
%S A227048 0,1,2,1,5,7,8,11,19,23,25,26,17,49,65,73,77,79,80,115,179,211,227,
%T A227048 235,239,241,242,217,473,601,665,697,713,721,725,727,728,139,1163,
%U A227048 1675,1931,2059,2123,2155,2171,2179,2183,2185,2186,2465,4513,5537,6049,6305
%N A227048 Irregular triangle read by rows: row n, for n >= 0, lists the nonnegative differences 3^n - 2^m, m >= 0, in increasing order.
%C A227048 A020914(n) = length of n-th row;
%C A227048 T(n,1) = A056577(n);
%C A227048 T(n,A098294(n)) = A001047(n);
%C A227048 T(n,A020914(n)) = A024023(n);
%C A227048 T(n,k) = A196486(n,A020914(n)-k) for n > 0, k = 1..A056576(n).
%H A227048 Reinhard Zumkeller, <a href="/A227048/b227048.txt">Rows n = 0..100 of triangle, flattened</a>
%e A227048 Initial rows:
%e A227048 0:  0
%e A227048 1:  1,2
%e A227048 2:  1,5,7,8
%e A227048 3:  11,19,23,25,26 (= 27-16, 27-8, 27-4, 27-2, 27-1)
%e A227048 4:  17,49,65,73,77,79,80
%e A227048 5:  115,179,211,227,235,239,241,242
%e A227048 6:  217,473,601,665,697,713,721,725,727,728
%e A227048 7:  139,1163,1675,1931,2059,2123,2155,2171,2179,2183,2185,2186
%e A227048 8:  2465,4513,5537,6049,6305,6433,6497,6529,6545,6553,6557,6559,6560
%e A227048 ...
%o A227048 (Haskell)
%o A227048 a227048 n k = a227048_tabf !! n !! (k-1)
%o A227048 a227048_row n = a227048_tabf !! n
%o A227048 a227048_tabf = map f a000244_list  where
%o A227048    f x = reverse $ map (x -) $ takeWhile (<= x) a000079_list
%Y A227048 Cf. A000079, A000244, A192111.
%Y A227048 See also A001047, A020914, A024023, A056576, A056577, A098294, A196486.
%K A227048 nonn,tabf
%O A227048 0,3
%A A227048 _Reinhard Zumkeller_, Jun 29 2013
%E A227048 Definition revised by _N. J. A. Sloane_, Oct 11 2019