A107309 Concatenation of twin primes in reverse order.

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

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