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Multiply and add: distinct numbers a*b + c*d + e*f + g*h + i*j where a..j are permutations of 0..9.
4

%I #5 Jan 07 2016 14:38:25

%S 60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,

%T 83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,

%U 104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119

%N Multiply and add: distinct numbers a*b + c*d + e*f + g*h + i*j where a..j are permutations of 0..9.

%C The sequence contains 77 terms, all the integers between 60 and 140 except 135, 138 and 139.

%H Lars Blomberg, <a href="/A266916/b266916.txt">Table of n, a(n) for n = 1..77</a>

%e 0*6 + 1*9 + 2*8 + 3*5 + 4*7 = 0 + 9 + 16 + 15 + 28 = 68 is in the sequence.

%Y Cf. A266914, A266915, A266917.

%K nonn,full,fini

%O 1,1

%A _Lars Blomberg_, Jan 06 2016