A128817 Primes which are 4 greater than the product of lesser twin primes.

7, 19, 81349, 3335149, 196773559, 13970922409, 150983758430839

Offset: 1

Author

Cino Hilliard, May 08 2007

Keywords

• nonn

Comments

Also primes which are 4 greater than the terms of A097489, where A097489 = product of first n terms of A001359 and A001359 = Lesser of twin primes.

a(8) = A097489(547) + 4 = 4.247...*10^2176. - Amiram Eldar, Jun 30 2024

Examples

			twinl#(2) = 3*5=15. 15+4 = 19 prime and the second term in the table.
		

Crossrefs

Cf. A001359, A097489.

Programs

PARI

twinl(n) = /* The n-th lower twin prime */ { local(c,x); c=0; x=1; while(c
				

Formula

Define twinl#(n)as the product of the first n lesser twin primes. Then if twinl#+4 is prime, list it.