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 A333295 Triangle read by rows: T(m,n) = Sum_{1 <= i <= m, 1 <= j <= n, gcd{i,j}=1} 1, where m >= n >= 1. 7
 1, 2, 3, 3, 5, 7, 4, 6, 9, 11, 5, 8, 12, 15, 19, 6, 9, 13, 16, 21, 23, 7, 11, 16, 20, 26, 29, 35, 8, 12, 18, 22, 29, 32, 39, 43, 9, 14, 20, 25, 33, 36, 44, 49, 55, 10, 15, 22, 27, 35, 38, 47, 52, 59, 63, 11, 17, 25, 31, 40, 44, 54, 60, 68, 73, 83, 12, 18, 26, 32, 42, 46, 57, 63, 71, 76, 87, 91 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This is the same triangle as A331781, except the initial row and column of 0's is missing. LINKS Table of n, a(n) for n=1..78. EXAMPLE Triangle begins: 1, 2, 3, 3, 5, 7, 4, 6, 9, 11, 5, 8, 12, 15, 19, 6, 9, 13, 16, 21, 23, 7, 11, 16, 20, 26, 29, 35, 8, 12, 18, 22, 29, 32, 39, 43, 9, 14, 20, 25, 33, 36, 44, 49, 55, 10, 15, 22, 27, 35, 38, 47, 52, 59, 63, 11, 17, 25, 31, 40, 44, 54, 60, 68, 73, 83, 12, 18, 26, 32, 42, 46, 57, 63, 71, 76, 87, 91, ... MAPLE V0 := proc(m, n) local a, i, j; a:=0; for i from 1 to m do for j from 1 to n do if igcd(i, j)=1 then a:=a+1; fi; od: od: a; end; for m from 1 to 14 do lprint([seq(V0(m, n), n=1..m)]); od: CROSSREFS Cf. A331781. Main diagonal is A018805. Sequence in context: A056878 A270520 A092557 * A081493 A144680 A209702 Adjacent sequences: A333292 A333293 A333294 * A333296 A333297 A333298 KEYWORD nonn,tabl AUTHOR N. J. A. Sloane, Mar 24 2020 STATUS approved

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Last modified August 5 17:42 EDT 2024. Contains 374953 sequences. (Running on oeis4.)