A063642 Primes of form p*q*r + 2, where p, q and r are primes (not necessarily distinct).

29, 47, 101, 107, 127, 149, 167, 173, 197, 233, 257, 263, 277, 281, 347, 359, 389, 401, 431, 457, 467, 479, 509, 541, 557, 563, 577, 607, 617, 641, 647, 653, 659, 727, 743, 761, 797, 863, 887, 911, 929, 937, 971, 983, 1019, 1087, 1097, 1129, 1181, 1187

Offset

1,1

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

Mathematica

With[{nn=50}, Take[Select[Times@@@Tuples[Prime[Range[nn]], 3]+2, PrimeQ]// Union, nn]] (* Harvey P. Dale, Jan 21 2021 *)

Prog

(PARI) { n=0; for (m=2, 10^9, p=prime(m); if (bigomega(p - 2) == 3, write("b063642.txt", n++, " ", p); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 26 2009

Crossrefs

Cf. A014612, A063640.

Sequence in context: A119891 A106754 A222413 * A108258 A232236 A228585

Adjacent sequences: A063639 A063640 A063641 * A063643 A063644 A063645

Keyword

nonn

Author

Reinhard Zumkeller, Jul 21 2001

Status

approved