A171469 Nonnegative nonprimes which are neither the sum nor the product of two distinct primes.

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

Links

Table of n, a(n) for n=1..56.

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

Cf. A000040, A166081, A109934, A141468, A006881.

Sequence in context: A063262 A156223 A048102 * A267685 A190584 A268598

Adjacent sequences: A171466 A171467 A171468 * A171470 A171471 A171472

Keyword

nonn

Author

Juri-Stepan Gerasimov, Dec 09 2009

Extensions

Definition clarified, sequence corrected (51 removed, 289 inserted) and extended by R. J. Mathar, Apr 24 2010

Status

approved