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A089786
Primes of the form prime(2k) followed by prime(k).
2
73, 197, 7129, 10141, 15161, 19379, 271109, 373157, 593251, 757331, 983431, 997433, 1069463, 1231547, 1361599, 1531661, 1571683, 1627727, 1831811, 2069911, 2161967, 2213977, 24731093, 25311103, 26931193, 27131213, 27911237, 28191259
OFFSET
1,1
LINKS
EXAMPLE
10141 is a term as a concatenation of prime(26)=101 followed by prime(13)=41.
MAPLE
a:=proc(k) local s, m: s:= [op(convert(ithprime(k), base, 10)), op(convert(ithprime(2*k), base, 10))]: m:=add(s[j]*10^(j-1), j=1..nops(s)): if not isprime(m) then RETURN(NULL) else RETURN(m) fi: end; seq(a(k), k=1..250); (C. Ronaldo)
MATHEMATICA
Select[Table[FromDigits[Flatten[IntegerDigits/@{Prime[2n], Prime[n]}]], {n, 250}], PrimeQ] (* Harvey P. Dale, Nov 17 2014 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 24 2003
EXTENSIONS
Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 25 2004
STATUS
approved