|
Search: id:A090093
|
|
|
| A090093 |
|
a(n) is the smallest composite number coprime to n, n+1, n+2, n+3. |
|
+0
4
|
|
| 25, 49, 49, 121, 121, 25, 121, 49, 49, 49, 25, 121, 121, 121, 49, 25, 49, 121, 169, 169, 25, 49, 49, 49, 121, 25, 121, 121, 49, 49, 25, 169, 169, 121, 121, 25, 49, 49, 121, 121, 25, 169, 49, 49, 49, 25, 121, 121, 121, 49, 25, 49, 169, 169, 169, 25, 49, 49, 49, 121, 25
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n)=A053672[n]^2
|
|
MATHEMATICA
|
m=0; Table[fla=1; Do[s=GCD[n, k]; s1=GCD[n, k+1]; s2=GCD[n, k+2]; s3=GCD[n, k+3]; If[Equal[s, 1]&&Equal[s1, 1] &&Equal[s2, 1]&&Equal[s3, 1]&&!PrimeQ[n]&&!Equal[n, 1] &&Equal[fla, 1], m=m+1; Print[n]; fla=0], {n, 1, 1000}], {k, 1, 256}]
|
|
CROSSREFS
|
Cf. A053669-A053674, A090090-A090093.
Sequence in context: A154082 A143278 A106632 this_sequence A004936 A062058 A069063
Adjacent sequences: A090090 A090091 A090092 this_sequence A090094 A090095 A090096
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), Nov 26 2003
|
|
|
Search completed in 0.002 seconds
|
