The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A103666 Primes p such that the largest prime divisor of p-1 is less than the largest prime divisor of p+1. 6
 5, 13, 17, 19, 37, 41, 43, 61, 67, 73, 97, 101, 109, 113, 137, 151, 157, 163, 181, 193, 197, 211, 229, 241, 251, 257, 271, 277, 281, 283, 313, 331, 337, 353, 379, 397, 401, 409, 421, 433, 443, 457, 463, 487, 491, 521, 523, 541, 547, 577, 601, 613, 617, 631 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Karl Hovekamp, Table of n, a(n) for n=1..39168 EXAMPLE a(1)=5 because the largest prime divisor of 4 is less than the largest prime divisor of 6. MATHEMATICA Select[Prime[Range[2, 200]], Max[Transpose[FactorInteger[#-1]][[1]]]< Max[Transpose[FactorInteger[#+1]][[1]]]&]  (* Harvey P. Dale, Apr 26 2011 *) CROSSREFS Cf. A023503 greatest prime divisor of n-th prime - 1, A023509 greatest prime divisor of n-th prime + 1, A103667. Sequence in context: A327638 A092218 A049092 * A082700 A212287 A174361 Adjacent sequences:  A103663 A103664 A103665 * A103667 A103668 A103669 KEYWORD nonn AUTHOR Hugo Pfoertner, Feb 19 2005 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 3 05:32 EDT 2020. Contains 336197 sequences. (Running on oeis4.)