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A007237 Number of triangles with integer sides and area = n times perimeter.
(Formerly M3878)
4
5, 18, 45, 45, 52, 139, 80, 89, 184, 145, 103, 312, 96, 225, 379, 169, 116, 498, 123, 328, 560, 280, 134, 592, 228, 271, 452, 510, 134, 1036, 144, 280, 639, 339, 597, 1119, 139, 354, 635, 648, 162, 1486, 169, 594, 1215, 354, 186, 1066, 369, 622 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Problem E3408, Amer. Math. Monthly, 99 (1992), 175-176.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..50.

CROSSREFS

Sequence in context: A213397 A101105 A037140 * A000339 A081435 A217866

Adjacent sequences:  A007234 A007235 A007236 * A007238 A007239 A007240

KEYWORD

nonn

AUTHOR

Simon Plouffe

EXTENSIONS

a(16)-a(50)from Les Reid (lesreid(AT)missouristate.edu), Jul 06 2010

STATUS

approved

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Last modified May 25 19:59 EDT 2013. Contains 225649 sequences.