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A147718 Primes of the form Prime(x)^2 + (Prime(x) - 1)^2. 0
5, 13, 41, 313, 1013, 1861, 3613, 7321, 9941, 10513, 13613, 20201, 21013, 34061, 52813, 59513, 99013, 218461, 277513, 353641, 370661, 391613, 424121, 427813, 481181, 584281, 632813, 702113, 750313, 820481, 825613, 904513, 1073113 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

These primes are hypotenuses of right triangles in which all sides are natural numbers.

LINKS

Table of n, a(n) for n=1..33.

MATHEMATICA

aa = {}; Do[If[PrimeQ[Prime[x]^2 + (Prime[x] - 1)^2], AppendTo[aa, Prime[x]^2 + (Prime[x] - 1)^2]], {x, 1, 1000}]; aa (* Artur Jasinski *)

CROSSREFS

A020882, A008846

Sequence in context: A080925 A164907 A085601 * A111009 A012172 A316536

Adjacent sequences:  A147715 A147716 A147717 * A147719 A147720 A147721

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 11 2008

STATUS

approved

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Last modified September 19 04:30 EDT 2019. Contains 327187 sequences. (Running on oeis4.)