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A168531 Numbers that are the products of 3 distinct primes and they are sum of 3 consecutive products of 3 distinct primes. 0
138, 285, 354, 715, 759, 861, 1158, 1335, 1362, 1390, 1498, 1582, 1767, 1834, 1986, 2013, 2065, 2255, 2298, 2345, 2390, 2406, 2702, 2865, 2967, 3201, 3245, 3302, 3435, 3678, 3730, 3801, 3846, 3874, 3955, 4015, 4053, 4090, 4142, 4498, 4521, 4551, 4634 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..43.

EXAMPLE

30+42+66=138, 78+102+105=285,..

MATHEMATICA

f[n_]:=Last/@FactorInteger[n]=={1, 1, 1}; a=30; b=42; lst={}; Do[If[f[n], p=a+b+n; If[f[p], AppendTo[lst, p]]; a=b; b=n], {n, 65, 7!}]; lst

CROSSREFS

Cf. A007304

Sequence in context: A264897 A202441 A187206 * A260133 A317579 A281592

Adjacent sequences:  A168528 A168529 A168530 * A168532 A168533 A168534

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Nov 28 2009

STATUS

approved

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Last modified December 2 11:44 EST 2021. Contains 349440 sequences. (Running on oeis4.)