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A071530
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The sum of 3 triangular numbers in exactly 2 ways.
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0
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3, 6, 7, 9, 10, 13, 15, 17, 18, 19, 23, 24, 25, 26, 32, 33, 35, 38, 41, 44, 47, 54, 60, 62, 68, 69, 74, 80, 83, 89, 95, 99, 110, 113, 119, 128, 179, 194
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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PROG
| (PARI) for(n=1, 150, if(sum(i=0, n, sum(j=0, i, sum(k=0, j, if(i*(i+1)/2+j*(j+1)/2+k*(k+1)/2-n, 0, 1))))==2, print1(n, ", ")))
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CROSSREFS
| Cf. A000217, A060773, A061262, A002636.
Cf. A064825, A002097, A008443, A064816.
Sequence in context: A129414 A157319 A138933 * A005767 A085837 A176237
Adjacent sequences: A071527 A071528 A071529 * A071531 A071532 A071533
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 02 2002
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 07 2002
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