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A151741 Composite which are the sum of three consecutive composite numbers. 5
18, 27, 36, 45, 49, 54, 63, 75, 78, 81, 85, 90, 95, 99, 102, 105, 117, 121, 126, 135, 143, 147, 150, 153, 161, 165, 168, 171, 175, 180, 185, 189, 192, 195, 203, 207, 216, 221, 225, 228, 231, 235, 243, 247, 255, 258, 261, 265, 273, 276, 279, 282, 285, 289, 297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

MATHEMATICA

Module[{c=Select[Range[300], CompositeQ], s3}, s3=Total/@Partition[c, 3, 1]; Intersection[c, s3]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 27 2019 *)

PROG

(PARI) c1=4; c2=6; for(c3=8, 299, isprime(c3) && next; isprime(c1+c2+c3) || print1(c1+c2+c3", "); c1=c2; c2=c3) \\ M. F. Hasler, Jun 16 2009

CROSSREFS

Cf. A151740-A151745, A060254, A060327, A060339, A096785, A096787, A135170.

Sequence in context: A186129 A284672 A265738 * A090064 A082804 A262277

Adjacent sequences:  A151738 A151739 A151740 * A151742 A151743 A151744

KEYWORD

nonn

AUTHOR

Claudio Meller, Jun 15 2009

STATUS

approved

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Last modified April 13 15:23 EDT 2021. Contains 342936 sequences. (Running on oeis4.)