|
|
A166499
|
|
Concatenation of the rightmost digit of the n-th prime and the leftmost digit of the (n+1)th prime.
|
|
5
|
|
|
23, 35, 57, 71, 11, 31, 71, 92, 32, 93, 13, 74, 14, 34, 75, 35, 96, 16, 77, 17, 37, 98, 38, 99, 71, 11, 31, 71, 91, 31, 71, 11, 71, 91, 91, 11, 71, 31, 71, 31, 91, 11, 11, 31, 71, 92, 12, 32, 72, 92, 32, 92, 12, 12, 72, 32, 92, 12, 72, 12, 32, 33, 73, 13, 33, 73, 13, 73, 73
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
This is the comma transform of the primes (see A367360).
|
|
LINKS
|
|
|
FORMULA
|
|
|
MAPLE
|
a:= n-> parse(cat(""||(ithprime(n))[-1], ""||(ithprime(n+1))[1])):
|
|
MATHEMATICA
|
With[{nmax=100}, Map[10Mod[#[[1]], 10]+IntegerDigits[#[[2]]][[1]]&, Partition[Prime[Range[nmax+1]], 2, 1]]] (* Paolo Xausa, Nov 24 2023 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|