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 A168477 Numbers that are the product of two distinct primes and they are sum of two consecutive products of two distinct primes. 1
 69, 77, 85, 106, 115, 134, 143, 159, 178, 187, 201, 217, 226, 237, 262, 267, 291, 301, 327, 355, 381, 395, 403, 411, 415, 422, 427, 437, 447, 502, 527, 565, 586, 597, 614, 623, 633, 649, 669, 674, 687, 713, 758, 763, 789, 793, 818, 849, 893, 898, 951, 959 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..52. EXAMPLE 6,10,14,15,21,22,26,33,34,35,38,39,46,..A006881 Numbers that are the product of two distinct primes 69=34+35, 77=38+39, 85=39+46,.. 69=3*13, 77=7*11, 85=5*13,.. MATHEMATICA f[n_]:=Last/@FactorInteger[n]=={1, 1}; a=6; lst={}; Do[If[f[n], p=a+n; If[f[p], AppendTo[lst, p]]; a=n], {n, 9, 7!}]; lst CROSSREFS Cf. A006881, A168474 Sequence in context: A253437 A325386 A260428 * A264045 A295806 A210614 Adjacent sequences: A168474 A168475 A168476 * A168478 A168479 A168480 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Nov 26 2009 STATUS approved

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Last modified June 9 23:19 EDT 2023. Contains 363183 sequences. (Running on oeis4.)