The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A255897 Primes equal to the sum of both two and three successive semiprimes. 1
 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 (list; graph; refs; listen; history; text; internal format)
 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: A141960 A178541 A157889 * 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

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.

Last modified May 17 09:03 EDT 2021. Contains 343969 sequences. (Running on oeis4.)