login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087602 Primes occurring as larger side of Heronian triangle (sides are consecutive integers, area and inradius are integers). 1
3, 5, 53, 140453 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Next term (if exists) is greater than 10^2000. [From Max Alekseyev (maxale(AT)gmail.com), May 14 2010]

FORMULA

p, p-1 and p-2 are sides of Heronian triangle.

Primes p such that 3*(p-1)^2 - 12 is a square. [From Max Alekseyev (maxale(AT)gmail.com), May 14 2010]

EXAMPLE

a(3)=53 because 53, 52 and 51 are sides of Heronian triangle (area is 1170, inradius is 15).

CROSSREFS

Cf. A001353, A016064, A087601.

Sequence in context: A101149 A056260 A020462 * A086340 A155121 A106914

Adjacent sequences:  A087599 A087600 A087601 * A087603 A087604 A087605

KEYWORD

more,nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Aug 07 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 17:35 EST 2012. Contains 206061 sequences.