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A128511
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Numbers which are both lucky and pentagonal.
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3
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1, 51, 477, 651, 925, 2625, 5551, 6501, 9801, 17767, 20475, 25285, 26467, 29751, 39285, 45327, 67947, 75825, 84135, 84847, 95887, 99717, 102051, 114955, 135751, 151527, 154401, 178365, 245835, 261877, 272001, 275847, 287547, 292825, 307587
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OFFSET
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1,2
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COMMENTS
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Second row of array T(k,n) = n-th Lucky number which is also a (k+3)-gonal number, for nonnegative k, whose zeroth and first rows are: A118565 Numbers which are both lucky and triangular. A031162 Numbers that are both lucky and square.
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LINKS
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FORMULA
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EXAMPLE
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MAPLE
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isA000326 := proc(n) local di ; if issqr(1+24*n) or n =0 then di := 1+sqrt(1+24*n); if di mod 6 = 0 or n = 0 then true ; else false ; fi ; else false ; fi; end: lin := fscanf("b000959.txt", "%d %d") : while lin <> [] do a := op(2, lin) ; if isA000326( a ) then printf("%d, ", a) ; fi ; lin := fscanf("b000959.txt", "%d %d") ; od : # R. J. Mathar, May 13 2007
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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