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!)
A107309 Concatenation of twin primes in reverse order. 0
53, 75, 1311, 1917, 3129, 4341, 6159, 7371, 103101, 109107, 139137, 151149, 181179, 193191, 199197, 229227, 241239, 271269, 283281, 313311, 349347, 421419, 433431, 463461, 523521, 571569, 601599, 619617, 643641, 661659, 811809, 823821, 829827, 859857, 883881, 10211019, 10331031, 10511049, 10631061, 10931091, 11531151 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..40.

Chris Caldwell, The First 1,008 Twin Primes.

EXAMPLE

The twin primes 41 and 43 are concatenated in reverse order to give 4341, which is the sixth term in the sequence.

MATHEMATICA

f[{a_, b_}]:=FromDigits[Join[IntegerDigits[b], IntegerDigits[a]]]; f/@Select[Partition[Prime[Range[200]], 2, 1], #[[2]]-#[[1]]==2&] (* Harvey P. Dale, Jan 01 2011 *)

CROSSREFS

Cf. A095958.

Sequence in context: A057667 A160041 A013538 * A039389 A043212 A043992

Adjacent sequences:  A107306 A107307 A107308 * A107310 A107311 A107312

KEYWORD

nonn,base,less

AUTHOR

Parthasarathy Nambi, May 20 2005

EXTENSIONS

More terms from Harvey P. Dale, Jan 01 2011

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 20 21:32 EDT 2020. Contains 337910 sequences. (Running on oeis4.)