A051267 Numbers n such that maximal value of prime divisors of reduced residue system for n is 3.

31, 37, 41, 43, 47, 49, 53, 55, 59, 61, 65, 67, 71, 73, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 106, 107, 109, 111, 113, 115, 116, 117, 118, 119, 121, 122, 123, 124, 125, 127, 128, 129, 131, 133, 134, 136, 137, 139, 141, 142, 143, 145, 146, 147

Offset

1,1

Comments

Largest value of A001221(k) = 3 for 1 <= k <= n such that gcd(k, n) = 1, i.e., k in row n of A038566. - Michael De Vlieger, Aug 10 2017

Links

Michael De Vlieger, Table of n, a(n) for n = 1..2446

Mathematica

Block[{n = 3, P}, P = Product[Prime@ i, {i, n}]; P + Position[#, n][[All, 1]] &@ Array[Max@ Map[PrimeNu, Cases[Range@ #, k_ /; CoprimeQ[#, k]]] &, 117, P + 1]] (* Michael De Vlieger, Aug 10 2017 *)

Crossrefs

Cf. A001221, A002110, A038566, A048597, A051250, A051265, A051266, A051268.

Sequence in context: A336178 A044973 A230035 * A073521 A180540 A279846

Adjacent sequences: A051264 A051265 A051266 * A051268 A051269 A051270

Keyword

nonn

Author

Labos Elemer

Status

approved