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A116509 Values of c in a^2 + b^2 = c^2 where b - a = 31 and gcd(a,b)=1. 0
41, 109, 221, 629, 1285, 3665, 7489, 21361, 43649, 124501, 254405, 725645, 1482781, 4229369, 8642281, 24650569, 50370905, 143674045, 293583149, 837393701, 1711127989, 4880688161, 9973184785, 28446735265, 58127980721 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

b - a = 31 is the fifth term of A058529

LINKS

Table of n, a(n) for n=1..25.

FORMULA

c(1)=41, c(2)=109, c(3)=221, c(4)=629, c(n) = 6*c(n-2) - c(n-4)

EXAMPLE

c(5)= 6*221-41=1285 and 893^2 + 924^2 = 1285^2 and 924-893=31 and gcd(893,924)=1

CROSSREFS

Sequence in context: A279213 A070270 A001125 * A105389 A266954 A290589

Adjacent sequences:  A116506 A116507 A116508 * A116510 A116511 A116512

KEYWORD

nonn

AUTHOR

Andras Erszegi (erszegi.andras(AT)chello.hu), Mar 21 2006

STATUS

approved

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Last modified May 12 11:55 EDT 2021. Contains 343821 sequences. (Running on oeis4.)