|
| |
|
|
A092126
|
|
Numbers n such that n, n+2, n+4, n+6 are semiprimes.
|
|
9
| |
|
|
213, 215, 299, 411, 1133, 1135, 1343, 1345, 1383, 1385, 1387, 1685, 1793, 1835, 1837, 1891, 1937, 1939, 1957, 2045, 2315, 2317, 2513, 2567, 2807, 2809, 2929, 3091, 3093, 3095, 3097, 3147, 3149, 3647, 3957, 3977, 3979, 4115, 4313, 4315, 4411, 4529, 4531
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Semiprimes in arithmetic progression. All terms are odd, see also A056809.
|
|
|
MATHEMATICA
| PrimeFactorExponentsAdded[n_] := Plus @@ Flatten[Table[ #[[2]], {1}] & /@ FactorInteger[n]]; Select[ Range[ 4626], PrimeFactorExponentsAdded[ # ] == PrimeFactorExponentsAdded[ # + 2] == PrimeFactorExponentsAdded[ # + 4] == PrimeFactorExponentsAdded[ # + 6] == 2 &] (from Robert G. Wilson v Feb 24 2004)
|
|
|
CROSSREFS
| Cf. A056809, A070552, A092125, A092127, A092128, A092129.
Sequence in context: A197106 A138568 A201104 * A085309 A092127 A082967
Adjacent sequences: A092123 A092124 A092125 * A092127 A092128 A092129
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Feb 22 2004
|
| |
|
|
