A167840 Six-times-isolated primes: primes p such that none of p+-2, p+-4, p+-6, p+-8, p+-10 nor p+-12 are prime.

2, 1847, 2179, 2503, 2819, 3137, 3433, 3967, 4177, 4621, 4831, 5623, 5953, 6637, 7283, 7369, 7393, 7433, 7621, 7993, 8039, 8147, 9257, 9587, 10753, 11027, 11197, 11213, 11369, 11657, 13063, 13367, 13381, 13537, 13553, 13649, 13859, 14107, 14221, 14369, 14503

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 13 2009, Mar 26 2010

Keywords

• nonn

Comments

Essentially the same as A137873. - R. J. Mathar, Dec 06 2009

Examples

			a(1)=2 (-10,-8,-6,-4,-2,0,4,6,8,10,12 are nonprimes);
a(2)=1847 (1835,1837,1839,1841,1843,1845,1849,1851,1853,1855,1857,1859 are nonprimes).
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000040, A137873, A167771, A167839.

Programs

Maple

q:= p-> not ormap(isprime, [seq([p+i, p-i][], i=2..12, 2)]):
select(q, [ithprime(i)$i=1..2000])[];  # Alois P. Heinz, Jan 03 2022

Extensions

More terms from Dmitry Kamenetsky, Nov 30 2009

Missing term 13553 inserted by Alois P. Heinz, Jan 03 2022