A115267 Primes of the form p*q*r-2, where p, q and r are distinct primes.

103, 163, 193, 229, 271, 283, 383, 397, 433, 463, 593, 607, 613, 643, 661, 739, 757, 859, 883, 967, 1013, 1021, 1063, 1093, 1103, 1129, 1171, 1237, 1279, 1307, 1433, 1453, 1489, 1493, 1531, 1543, 1549, 1579, 1597, 1613, 1657, 1693, 1741, 1747, 1831

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

{A007304(n)-2} INTERSECTION {A000040}. - Jonathan Vos Post, Mar 06 2006

Example

103 = 3*5*7-2, 163 = 3*5*11-2 etc.

Mathematica

Select[Prime[Range[400]], Length[FactorInteger[ #+2]]==Plus@@(Last/@FactorInteger[ #+2])==3&]

Crossrefs

Cf. A115093 Primes of the form p*q-2, where p and q are distinct primes.

Cf. A000040, A001359, A007304, A115093.

Sequence in context: A328822 A141962 A309412 * A107217 A142942 A142098

Adjacent sequences: A115264 A115265 A115266 * A115268 A115269 A115270

Keyword

nonn

Author

Zak Seidov, Mar 04 2006

Status

approved