A078860 Least positive residues [mod 210] representing those residue classes which can be lesser of prime pairs from A029710.

7, 13, 19, 37, 43, 67, 79, 97, 103, 109, 127, 139, 163, 169, 187, 193

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Formula

Intersection[RRS(210), 4+RRS{210)]-4 and {7}. RRS[210]=reduced residue system of 210=first 48=phi[210] terms of A008364; additional term 7 is a singular cases; 210k+r generates complete A029710 with suitable k and r taken from these 15+1 numbers.

Mathematica

t=Flatten[Position[Table[GCD[w, 210], {w, 1, 210}], 1]] t2=Intersection[t, t+4]-4

Crossrefs

Cf. A029710, A008364, A078859.

Sequence in context: A048646 A152087 A098059 * A029710 A145897 A078863

Adjacent sequences: A078857 A078858 A078859 * A078861 A078862 A078863

Keyword

fini,full,nonn

Author

Labos Elemer, Dec 13 2002

Status

approved