A369249 Primes of the form 4*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, 7, 11, 19, 23, 31, 43, 47, 59, 67, 79, 83, 107, 127, 139, 163, 179, 223, 227, 283, 307, 347, 367, 379, 443, 463, 499, 523, 547, 571, 619, 643, 659, 683, 787, 827, 883, 907, 947, 967, 1039, 1087, 1123, 1171, 1259, 1327, 1423, 1459, 1483, 1523, 1567, 1579, 1627, 1699, 1723, 1747, 1759, 1787, 1987, 1999, 2083, 2143

Offset: 1

Author

Antti Karttunen, Jan 22 2024

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..20000

Crossrefs

Intersection of A002145 and A369056.

Setwise difference A002145 \ A369250.

Cf. A369054.

Cf. also A189483.

Programs

PARI

isA369249(n) = ((3==(n%4)) && isprime(n) && !A369054(n)); \\ Needs also program from A369054.