A091016 a(n) is the least x such that the n values x+0, x+6, x+12, ..., x+6*(n-1) are all products of exactly two primes (i.e., semiprimes).

4, 4, 9, 203, 1333, 1333, 1333, 2159, 8309, 18799, 60499, 60499, 186779, 186779, 186779, 12015573923, 12015573923, 6763513182767

Offset: 1

Author

Don Reble, Feb 25 2004

Keywords

• nonn
• fini

Comments

a(19) > 1.e14 if it exists. - Hugo van der Sanden, Aug 06 2021

Examples

			a(4)=203 because 203 = 7*29, 209 = 11*19, 215 = 5*43, 221 = 13*17.
		

Crossrefs

Cf. A082919, A092129. Row 6 of A124570.

Extensions

a(8) and a(9) corrected and a(18) from Donovan Johnson, Oct 01 2010