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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A109166 Numbers n such that the concatenation of consecutive increasing numbers beginning with prime(n) and ending with prime(n+1) is prime; or n such that A111875(n) is prime. 0
1, 37, 58, 119, 130, 195, 292, 419, 453, 464, 561, 617, 618, 652, 679, 720, 762, 787, 827, 830, 945, 1034, 1090, 1139, 1191, 1200, 1344, 1383, 1386, 1451, 1496, 1519, 1774, 1783, 1820, 1822, 1911, 1966, 1973, 2018, 2128, 2219, 2247, 2378, 2566, 2644 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Honaker's prime curiosity corresponds to a(2)=37. Concatenating all the increasing numbers from prime(1473480)=23428439 to prime(1473481)=23428523 produces a 680-digit prime (certified).

LINKS

Table of n, a(n) for n=1..46.

G. L. Honaker, Jr., Prime Curios

EXAMPLE

a(3)=58 because prime(58)=271 and prime(59)=277 and 271272273274275276277

is prime.

CROSSREFS

Sequence in context: A134222 A179150 A127023 * A090798 A000928 A073276

Adjacent sequences:  A109163 A109164 A109165 * A109167 A109168 A109169

KEYWORD

easy,nonn,base

AUTHOR

Jason Earls, Aug 18 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 18:00 EDT 2018. Contains 316427 sequences. (Running on oeis4.)