|
| |
|
|
A092129
|
|
Numbers n such that n, n+2, n+4, n+6, n+8, n+10, n+12 are semiprimes.
|
|
11
|
|
|
|
3091, 8129, 8131, 9983, 9985, 55559, 92603, 99443, 99445, 112709, 132077, 132079, 182749, 190937, 190939, 209479, 237449, 237451, 239089, 249689, 296779, 300449, 313411, 401429, 401431, 441677, 441679, 452639, 452641, 547157, 604487, 604489
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Semiprimes in arithmetic progression. All terms are odd, see also A056809.
|
|
|
LINKS
|
Table of n, a(n) for n=1..32.
|
|
|
MATHEMATICA
|
PrimeFactorExponentsAdded[n_] := Plus @@ Flatten[Table[ #[[2]], {1}] & /@ FactorInteger[n]]; Select[ Range[ 631200], PrimeFactorExponentsAdded[ # ] == PrimeFactorExponentsAdded[ # + 2] == PrimeFactorExponentsAdded[ # + 4] == PrimeFactorExponentsAdded[ # + 6] == PrimeFactorExponentsAdded[ # + 8] == PrimeFactorExponentsAdded[ # + 10] == PrimeFactorExponentsAdded[ # + 12] == 2 &] (from Robert G. Wilson v Feb 24 2004)
|
|
|
CROSSREFS
|
Cf. A056809, A070552, A092125, A092126, A092127, A092128.
Sequence in context: A186470 A045079 A195811 * A206132 A187305 A103523
Adjacent sequences: A092126 A092127 A092128 * A092130 A092131 A092132
|
|
|
KEYWORD
|
easy,nonn
|
|
|
AUTHOR
|
Zak Seidov, Feb 22 2004
|
|
|
EXTENSIONS
|
More terms from Don Reble (djr(AT)nk.ca), Feb 23 2004
More terms from Robert G. Wilson v, Feb 24 2004
|
|
|
STATUS
|
approved
|
| |
|
|
