login
A171469
Nonnegative nonprimes which are neither the sum nor the product of two distinct primes.
1
0, 1, 4, 27, 117, 121, 125, 135, 147, 171, 189, 207, 245, 255, 261, 275, 289, 297, 325, 343, 345, 357, 363, 387, 405, 425, 429, 455, 475, 477, 483, 495, 507, 513, 529, 531, 539, 555, 561, 567, 575, 585, 605, 625, 627, 637, 639, 651, 657, 665, 705, 715, 725, 747, 765, 777
OFFSET
1,3
MATHEMATICA
prs=Prime[Range[150]];
prodprs=Times@@@Subsets[prs, {2}];
sumprs=Plus@@@Subsets[prs, {2}];
Complement[Range[0, 800], prs, prodprs, sumprs] (* Harvey P. Dale, Jan 23 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Definition clarified, sequence corrected (51 removed, 289 inserted) and extended by R. J. Mathar, Apr 24 2010
STATUS
approved