A168530 Numbers that are the product of two distinct primes and they are sum of 3 consecutive products of two distinct primes.

39, 58, 69, 93, 123, 177, 185, 253, 278, 295, 417, 446, 478, 538, 566, 597, 614, 698, 749, 766, 794, 898, 917, 982, 998, 1042, 1059, 1149, 1159, 1286, 1351, 1393, 1441, 1546, 1623, 1639, 1649, 1658, 1718, 1766, 1799, 1822, 1939, 1966, 2045, 2078, 2126

Offset

1,1

Links

Table of n, a(n) for n=1..47.

Example

10+14+15=39, 15+21+22=58,..

Mathematica

f[n_]:=Last/@FactorInteger[n]=={1, 1}; a=6; b=10; lst={}; Do[If[f[n], p=a+b+n; If[f[p], AppendTo[lst, p]]; a=b; b=n], {n, 13, 7!}]; lst

Crossrefs

Cf. A006881, A168474, A168477

Sequence in context: A327586 A156333 A116281 * A253436 A253429 A338794

Adjacent sequences: A168527 A168528 A168529 * A168531 A168532 A168533

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Nov 28 2009

Status

approved