This site is supported by donations to The OEIS Foundation.

 Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A051268 Numbers n such that maximal value of prime divisors of reduced residue system for n is 4. 5
 211, 221, 223, 227, 229, 233, 239, 241, 247, 251, 253, 257, 263, 269, 271, 277, 281, 283, 289, 293, 299, 307, 311, 313, 317, 319, 323, 331, 337, 341, 343, 347, 349, 353, 359, 361, 367, 371, 373, 377, 379, 383, 389, 391, 397, 401, 403, 407, 409, 413 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Largest value of A001221(k) = 4 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..10000 MATHEMATICA Block[{n = 4, P}, P = Product[Prime@ i, {i, n}]; P + Position[#, n][[All, 1]] &@ Array[Max@ Map[PrimeNu, Cases[Range@ #, k_ /; CoprimeQ[#, k]]] &, 175, P + 1]] (* Michael De Vlieger, Aug 10 2017 *) CROSSREFS Cf. A001221, A002110, A006862, A038566, A048597, A051250, A051265, A051266, A051267. Sequence in context: A064826 A136601 A108406 * A159911 A133959 A133960 Adjacent sequences:  A051265 A051266 A051267 * A051269 A051270 A051271 KEYWORD nonn AUTHOR EXTENSIONS More terms from Michael De Vlieger, Aug 10 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 21 14:44 EST 2017. Contains 295002 sequences.