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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A144550 Largest non-twin prime < n-th and (n+1)-th twin primes. 0
2, 23, 37, 53, 67, 97, 131, 173, 223, 233, 263, 277, 307, 337, 409, 457, 509, 563, 593, 613, 631, 653, 797, 853, 877, 1013, 1039, 1087, 1129, 1223, 1259, 1283, 1297, 1307, 1423, 1447, 1471, 1601, 1613, 1663, 1693, 1709, 1783, 1867, 1913, 1993, 2017, 2069 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..48.

FORMULA

{A007510(k): nextprime(A007510(k)) in A077800}. - R. J. Mathar, May 01 2010

MAPLE

isA077800 := proc(n) isprime(n) and ( isprime(n+2) or isprime(n-2)) ; end proc:

isA007510 := proc(n) isprime(n) and not isA077800(n) ; end proc:

isA144550 := proc(n) isA007510(n) and isA077800( nextprime(n)) ; end proc:

for n from 2 to 2500 do if isA144550(n) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, May 01 2010

CROSSREFS

Cf. A077800, A088175.

Sequence in context: A061448 A007510 A117242 * A106736 A045392 A107374

Adjacent sequences:  A144547 A144548 A144549 * A144551 A144552 A144553

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Dec 31 2008

EXTENSIONS

Corrected (1993 inserted) by R. J. Mathar, May 01 2010

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 January 17 19:58 EST 2019. Contains 319251 sequences. (Running on oeis4.)