cp's OEIS Frontend

A139369 Array read by antidiagonals, n-th sum of 2 distinct powers of k.

%I A139369 #2 Mar 30 2012 18:40:45
%S A139369 3,4,5,5,10,6,6,17,12,9,7,26,20,28,10,8,37,30,65,30,12,9,50,42,126,68,
%T A139369 36,17,10,65,56,217,130,80,82,18,11,82,72,344,222,150,257,84,20,12,
%U A139369 101,90,513,350,252,626,260,90,24,13,122,110,730,520,392,1297,630,272,108
%N A139369 Array read by antidiagonals, n-th sum of 2 distinct powers of k.
%C A139369 n=2 column is A002522 n^2 + 1.
%C A139369 n=3 column is A002378 n*(n+1) Oblong (or pronic, promic, or heteromecic numbers).
%e A139369 Array begins:
%e A139369 ================================================================================
%e A139369 k....|.n=1.|.n=2.|.n=3.|..n=4.|..n=5.|..n=6.|...n=7.|...n=8.|..n=9.|.n=10|.OEIS.
%e A139369 ================================================================================
%e A139369 k=2..|..3..|...5.|..6..|....9.|...10.|...12.|....17.|...18..|...20.|..24.|A018900
%e A139369 k=3..|..4..|..10.|.12..|...28.|...30.|...36.|....82.|...84..|...90.|..108|A038464
%e A139369 k=4..|..5..|..17.|.20..|...65.|...68.|...80.|...257.|..260..|..272.|..320|A038470
%e A139369 k=5..|..6..|..26.|.30..|..126.|..130.|..150.|...626.|..630..|..650.|..750|A038474
%e A139369 k=6..|..7..|..37.|.42..|..217.|..222.|..252.|..1297.|..1302.|.1332.|.1512|A038478
%e A139369 k=7..|..8..|..50.|.56..|..344.|..350.|..392.|..2402.|..2408.|.2450.|.2744|A038481
%e A139369 k=8..|..9..|..65.|.72..|..513.|..520.|..576.|..4097.|..4104.|.4160.|.4608|A038484
%e A139369 k=9..|.10..|..82.|.90..|..730.|..738.|..810.|..6562.|..6570.|.6642.|.7290|A038487
%e A139369 k=10.|.11..|.101.|.110.|.1001.|.1010.|.1100.|.10001.|.10010.|10100.|11000|A038444
%e A139369 k=11.|.12..|.122.|.132.|.1332.|.1342.|.1452.|.14642.|.14652.|14762.|15972|A038490
%e A139369 k=12.|.13..|.145.|.156.|.1729.|.1740.|.1872.|.20737.|.20748.|20880.|22464|A038492
%e A139369 ================================================================================
%Y A139369 Cf. A002378, A002522, A018900, A038464, A038470, A038474, A038478, A038481, A038484, A038487, A038444, A038490, A038492.
%K A139369 easy,nonn,tabl
%O A139369 1,1
%A A139369 _Jonathan Vos Post_, Jun 07 2008