

A134930


Nearestneighbors of twin primes.


5



2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 28, 30, 32, 40, 42, 44, 58, 60, 62, 70, 72, 74, 100, 102, 104, 106, 108, 110, 136, 138, 140, 148, 150, 152, 178, 180, 182, 190, 192, 194, 196, 198, 200, 226, 228, 230, 238, 240, 242, 268, 270, 272, 280, 282, 284
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

This sequence consists of the number 2 followed by the triplet composites: A134928.


LINKS

Table of n, a(n) for n=1..55.
Omar E. Pol, Determinacion geometrica de los numeros primos y compuesto.


FORMULA

a(1)=2. For n>2, a(n)=A134928(n1)


EXAMPLE

2, 4 and 6 are nearestneighbors of twin primes because 3 and 5 are twin primes.


MATHEMATICA

f[{a_, b_}]:={a1, a+1, b+1}; Union[Flatten[f/@Select[Partition[Prime[ Range[ 100]], 2, 1], Last[#]First[#]==2&]]] (* Harvey P. Dale, Aug 16 2011 *)


CROSSREFS

Sequence in context: A234521 A085125 A194402 * A084562 A240714 A187350
Adjacent sequences: A134927 A134928 A134929 * A134931 A134932 A134933


KEYWORD

easy,nonn


AUTHOR

Omar E. Pol, Nov 16 2007


STATUS

approved



