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.

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

Offset: 1

Author

Pierre CAMI, Aug 21 2008

Keywords

• nonn

Examples

			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
		

Links

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

Crossrefs

Cf. A091592.