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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117473 The values of 'a' in a^2 + b^2 = c^2, where b - a = 17 and gcd(a,b,c)=1. 1
7, 28, 88, 207, 555, 1248, 3276, 7315, 19135, 42676, 111568, 248775, 650307, 1450008, 3790308, 8451307, 22091575, 49257868, 128759176, 287095935, 750463515, 1673317776, 4374021948, 9752810755, 25493668207 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

b - a = 17 is the third term in A058529

FORMULA

a(1)=7, a(2)=28, a(3)=207, a(4)=555, a(n)=6*a(n-2) - a(n-4) + 34

EXAMPLE

a(5) = 6*88 - 7 + 34 = 555 and 555^2 + 572^2 = 797^2 and 572-555=17 and gcd(555, 572, 797) = 1

CROSSREFS

Cf. A058529, A117472.

Sequence in context: A144900 A054469 A156928 * A163037 A022572 A193654

Adjacent sequences:  A117470 A117471 A117472 * A117474 A117475 A117476

KEYWORD

nonn

AUTHOR

Andras Erszegi (erszegi.andras(AT)chello.hu), Mar 19 2006

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 15 15:20 EST 2012. Contains 205823 sequences.