A092192 Semiprimes that are the sum of two successive semiprimes.

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

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: A188651 A330203 A272307 * A119039 A047189 A278921

Adjacent sequences: A092189 A092190 A092191 * A092193 A092194 A092195

Keyword

easy,nonn

Author

Zak Seidov, Feb 23 2004

Status

approved