login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A092192 Semiprimes that are the sum of two successive semiprimes. 7
10, 15, 51, 69, 77, 85, 95, 106, 115, 134, 143, 159, 178, 187, 201, 217, 226, 237, 262, 267, 291, 301, 327, 335, 346, 355, 361, 381, 395, 403, 411, 415, 422, 427, 437, 447, 502, 527, 565, 586, 597, 614, 623, 633, 649, 669, 674, 687, 713, 723, 758, 763, 789 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Zak Seidov, Table of n,a(n) for n=1..10000.

EXAMPLE

51 is a member because 51=25+26, sum of 9th and 10th semiprimes.

MATHEMATICA

Select[Total/@Partition[Select[Range[400], PrimeOmega[#]==2&], 2, 1], PrimeOmega[ #]==2&] (* Harvey P. Dale, Jan 19 2019 *)

CROSSREFS

Cf. A092191.

Sequence in context: A048061 A188651 A272307 * A119039 A047189 A278921

Adjacent sequences:  A092189 A092190 A092191 * A092193 A092194 A092195

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Feb 23 2004

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 22 12:39 EDT 2019. Contains 321421 sequences. (Running on oeis4.)