A092190 Semiprimes that are the sum of the first n semiprimes for some n.

4, 10, 58, 185, 219, 254, 377, 589, 843, 917, 1247, 1707, 2157, 2519, 2642, 2771, 3755, 4227, 5078, 5633, 6433, 6638, 7053, 9031, 15469, 16109, 17414, 18763, 19109, 21281, 22421, 23591, 26827, 28093, 35489, 35978, 36471, 37469, 38987, 41578, 42634

Offset: 1

Author

Zak Seidov, Feb 23 2004

Keywords

• easy
• nonn

Examples

			10 is a term because the sum of the first two semiprimes 4 and 6 is 10.
		

Links

• Zak Seidov, Table of n, a(n) for n = 1..5000

Crossrefs

Corresponding values of n: A092189.

Programs

Mathematica

s = Select[Range@ 40882, PrimeOmega@ # == 2 &]; Select[Accumulate[s[[1 ;; 164]]], PrimeOmega@ # == 2 &] (* Michael De Vlieger, Sep 21 2015 *)

PARI

is_A092190(N)={bigomega(N)==2 & is_A062198(N)}  \\ M. F. Hasler, Sep 23 2012

PARI

A092190(n,list=0,b=2)={my(s=0,N=0); while(n, until(bigomega(N++)==b,); bigomega(s+=N)==b & n-- & list & print1(s",")); s}  \\ M. F. Hasler, Sep 23 2012

Formula

Equals A062198 intersect A001358. - M. F. Hasler, Sep 23 2012