A369248 Numbers of the form 12*m+3 for which there is no representation as a sum (p*q + p*r + q*r) with three odd primes p <= q <= r.

3, 15, 63, 99, 159, 171, 207, 219, 243, 279, 303, 339, 387, 399, 531, 579, 603, 639, 675, 699, 747, 783, 819, 879, 891, 963, 1059, 1107, 1143, 1179, 1215, 1227, 1299, 1323, 1359, 1467, 1527, 1563, 1611, 1659, 1731, 1779, 1791, 1803, 1899, 1923, 1971, 1983, 2007, 2019, 2115, 2235, 2319, 2403, 2427, 2487, 2499, 2547

Offset: 1

Author

Antti Karttunen, Jan 22 2024

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10516

Crossrefs

Intersection of A017557 and A369056, multiples of 3 in the latter.

Cf. A369054, A369055.

Programs

PARI

isA369248(n) = ((3==(n%12)) && !A369054(n)); \\ Needs also code from A369054.