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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A075608 a(1) = 1, a(n) = smallest composite number not occurring earlier such that the concatenation a(n-1) and a(n) is a prime. 3
1, 9, 77, 27, 49, 33, 91, 51, 133, 39, 119, 69, 143, 21, 121, 57, 203, 93, 169, 63, 247, 81, 299, 147, 209, 123, 217, 87, 187, 111, 253, 153, 259, 99, 289, 129, 221, 159, 161, 141, 301, 177, 319, 117, 329, 201, 287, 219, 361, 183, 343, 237, 581, 171, 341, 273, 323 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..57.

CROSSREFS

Cf. A075607, A075609, A075610.

Sequence in context: A324354 A209667 A276754 * A330630 A282327 A263471

Adjacent sequences:  A075605 A075606 A075607 * A075609 A075610 A075611

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 28 2002

EXTENSIONS

More terms from Michel ten Voorde Jun 23 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 September 24 22:33 EDT 2021. Contains 347651 sequences. (Running on oeis4.)