login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082663 Numbers k such that A082647(k) = A000005(k) - 1 = 3. 8
15, 35, 77, 91, 143, 187, 209, 221, 247, 299, 323, 391, 437, 493, 527, 551, 589, 667, 703, 713, 851, 899, 943, 989, 1073, 1147, 1189, 1247, 1271, 1333, 1363, 1457, 1517, 1537, 1591, 1643, 1739, 1763, 1829, 1891, 1927, 1961, 2021, 2173, 2183, 2257, 2279 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A082647(p^2) = A000005(p^2) - 1 = 2, where p is odd prime.

Numbers of the form p*q, where p and q are odd primes and p < q < 2*p. - Vladeta Jovovic, Jan 23 2004

Numbers n such that A229964(n) = 2. - Eric M. Schmidt, Oct 05 2013

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1...1000 from Vincenzo Librandi)

MATHEMATICA

f[n_]:=Last/@FactorInteger[n]=={1, 1}&&FactorInteger[n][[1, 1]]>2&&Floor[FactorInteger[n][[2, 1]]/FactorInteger[n][[1, 1]]]==1; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 7!}]; lst (* Vladimir Joseph Stephan Orlovsky, May 19 2010 *)

CROSSREFS

Cf. A000005, A056913, A046388, A082647, A229964.

Sequence in context: A098271 A234542 A242235 * A109068 A238232 A061367

Adjacent sequences:  A082660 A082661 A082662 * A082664 A082665 A082666

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto, May 18 2003

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 14 07:15 EDT 2019. Contains 327995 sequences. (Running on oeis4.)