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A051859 Values of C (the hypotenuse) of a Pythagorean triangle with A (the short leg) and C both prime and part of a twin prime. 5
5, 13, 61, 181, 421, 5101, 60901, 135721, 161881, 163021, 218461, 595141, 1108561, 2574181, 2740141, 3248701, 3535141, 3723721, 3729181, 8197201, 13933921, 20218441, 23605321, 28569241, 33874681, 47248921, 68667481, 69372421 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms of the sequence must be part of a Pythagorean triple of the form (2u-1), 2u*(u-1), (2u^2 - 2u + 1). - Joshua Zucker, May 12 2006

LINKS

Table of n, a(n) for n=1..28.

FORMULA

A051858 + 1, or 2*A051891^2 - 2*A051891 + 1, or 2*A051892^2 + 2*A051892 + 1. - Joshua Zucker, May 12 2006

CROSSREFS

See A051642 for the A's and A051858 for the B's.

Subset of A067756.

Sequence in context: A319249 A067756 A284035 * A151275 A149567 A149568

Adjacent sequences:  A051856 A051857 A051858 * A051860 A051861 A051862

KEYWORD

nonn

AUTHOR

Stuart M. Ellerstein (ellerstein(AT)aol.com), Dec 14 1999

EXTENSIONS

More terms from Joshua Zucker, May 12 2006

STATUS

approved

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Last modified January 22 16:37 EST 2020. Contains 331152 sequences. (Running on oeis4.)