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A143509 First of a pair of twin primes of the form n^2+x with x<2*n, or 0 if no such prime exist. 1
2, 5, 11, 17, 29, 41, 59, 71, 0, 107, 137, 149, 179, 197, 227, 269, 311, 347, 0, 419, 461, 521, 569, 599, 641, 0, 0, 809, 857, 0, 1019, 1031, 1091, 0, 1277, 1301, 1427, 1451, 0, 1607, 1697, 1787, 1871, 1949, 2027, 2129, 2237, 2309, 0, 2549, 2657, 2711, 0, 2969 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Pierre CAMI, Table of n, a(n) for n = 1..10000

EXAMPLE

1^2+1=2 x=1, x<2*1 and 2 and 3 twin primes so a(1)=2

2^2+1=5 x=1, x<2*2 and 5 and 7 twin primes so a(2)=5

3^2+2=11 x=2, x<2*3 and 11 and 13 twin primes so a(3)=11

CROSSREFS

Cf. A091592.

Sequence in context: A124850 A156850 A156611 * A111166 A064337 A076873

Adjacent sequences:  A143506 A143507 A143508 * A143510 A143511 A143512

KEYWORD

nonn

AUTHOR

Pierre CAMI, Aug 21 2008

STATUS

approved

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)