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A095225
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Triangle read by rows in which the n-th row contains the n smallest triangular numbers with the least significant digits of the n-th triangular number.
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2
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1, 3, 153, 6, 36, 66, 10, 210, 16110, 19110, 15, 2415, 8515, 18915, 21115, 21, 3321, 7021, 18721, 21321, 39621, 28, 528, 1128, 2628, 3828, 6328, 8128, 36, 136, 16836, 18336, 21736, 23436, 73536, 76636, 45, 2145, 9045, 18145, 21945, 35245, 55945
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table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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1;
3, 153;
6, 36, 66;
10, 210, 16110, 19110;
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MAPLE
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A000217 := proc(n) n*(n+1)/2 ; end: A095225 := proc(nrow) local a, i, dlen; i := nrow ; a := [A000217(i)] ; dlen := ilog10(a[1])+1 ; while nops(a) < nrow do i := i+1 ; if A000217(i) mod 10^dlen = a[1] then a := [op(a), A000217(i)] ; fi ; od ; RETURN(a) ; end: seq(op(A095225(n)), n=1..10) ; # R. J. Mathar, Aug 03 2007
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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