A255897 Primes equal to the sum of both two and three successive semiprimes.

19, 73, 233, 719, 839, 2287, 2593, 5927, 6551, 6833, 6991, 7129, 10639, 11593, 15551, 18049, 20347, 20719, 20749, 22073, 23117, 25111, 26633, 27967, 28607, 30161, 31729, 32969, 38449, 39761, 40361, 41479, 42359, 45083, 47287

Offset

1,1

Comments

Intersection of A108183 and A255889.

Links

Zak Seidov, Table of n, a(n) for n = 1..350

Example

19=9+10=4+6+9, 73=35+38=22+25+26.

Mathematica

Module[{nn=25000, sp, c2, c3}, sp=Select[Range[nn], PrimeOmega[#]==2&]; c2= Select[ Total/@Partition[sp, 2, 1], PrimeQ]; c3=Select[Total/@Partition[ sp, 3, 1], PrimeQ]; Intersection[c2, c3]] (* Harvey P. Dale, Sep 21 2019 *)

Crossrefs

Cf. A000040, A001358, A108183, A255889.

Sequence in context: A178541 A157889 A361677 * A220447 A294460 A118593

Adjacent sequences: A255894 A255895 A255896 * A255898 A255899 A255900

Keyword

nonn

Author

Zak Seidov, Mar 09 2015

Extensions

Definition clarified by Harvey P. Dale, Sep 21 2019

Status

approved