A137628 Semiprimes (p+4) associated with last prime in A137626.

6, 35, 185, 737, 1781, 8367, 8373, 19277, 175337, 175353, 33952823, 4377722981, 4377723017, 1242030992721, 1242030992727

Offset: 1

Author

Enoch Haga, Jan 30 2008

Keywords

• more
• nonn

Examples

			a(2)=35 because when p=29 (resp. 31), p+4=33 (resp. 35) and are semiprime (3*3 resp. 5*7).
		

Crossrefs

Cf. A001358, A137625, A137626, A137627.

Formula

For each p, the semiprime is p + 4.

a(n) = A137626(n) + 4. - Sean A. Irvine, Feb 13 2012

Extensions

a(11) from Sean A. Irvine, Feb 12 2012

a(1) corrected for consistency with change in A137626 by Sean A. Irvine, Jun 21 2018

a(12)-a(15) from Giovanni Resta, Jun 22 2018