A134701 Smallest initial prime, greater than 3, of a prime chain of length n under the iteration x->2x-3.

5, 5, 5, 5, 13, 283, 283, 1823, 443119823, 35332754383, 57704757113, 69478435945493, 2235755385712423, 5314285836920063, 300677829503061013

Offset: 1

Author

Don Reble, Nov 07 2007

Keywords

• nonn
• more

Examples

			a(3) = 5 because 5, 5*2-3=7, 7*2-3=11 and 11*2-3=19 are primes.
		

Crossrefs

Cf. A084954.

Extensions

a(14)-a(15) from Bert Dobbelaere, May 28 2025