login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A053340 Terms of A050530 with four prime divisors. 1
5865, 8645, 10005, 10465, 13685, 15045, 15295, 16269, 18285, 20445, 22015, 24871, 26845, 27965, 28405, 28815, 29733, 30705, 31031, 31255, 33215, 35245, 36105, 37037, 37145, 37365, 37765, 37995, 38985, 39831, 40579, 41041, 43435, 44135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

n=pqrs, having 4 prime divisors, squarefree and n-phi(n) is a prime

EXAMPLE

The 3rd entry is 10005=3*5*23*29, also in A050530 and A051953(10005)=5077 is a prime.

CROSSREFS

Cf. A051953, A050530.

Sequence in context: A183843 A212478 A333232 * A291597 A233945 A264216

Adjacent sequences:  A053337 A053338 A053339 * A053341 A053342 A053343

KEYWORD

nonn

AUTHOR

Labos Elemer, Jan 05 2000

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 27 21:14 EDT 2022. Contains 354110 sequences. (Running on oeis4.)