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A068967 Numbers that define integer Heronian triangles [a(n), prime(a(n)), A068968(n)] with area A068969(n). 2
3, 12, 25, 30, 37, 51, 60, 65, 65, 100, 116, 260, 273, 761, 761, 825, 884, 1092, 1476, 1695, 1695, 1752, 2374, 2415, 3048, 3552 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Eric Weisstein's World of Mathematics, Heronian Triangle.

EXAMPLE

a(5) = 37: [37, A000040(37), A068968(5)] = [37,157,130], with s = (36+157+130)/2 = 162: Area^2 = s*(s-37)*(s-157)*(s-130) = 162*125*5*32 = 3240000 = 1800*1800, therefore A068969(5) = 1800.

CROSSREFS

Sequence in context: A047166 A076506 A009776 * A071355 A199242 A169678

Adjacent sequences:  A068964 A068965 A068966 * A068968 A068969 A068970

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 30 2002

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.