OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..250
EXAMPLE
a(3) = 4111, 4 followed by three copies of 1.
MAPLE
cat3 := proc(a, b, n) local resu, i ; resu := a ; for i from 1 to n do resu := resu*10^( max(1, ilog10(b)+1) )+b ; od: RETURN(resu) ; end: A112748 := proc(n) local a, k; for k from 1 do a := cat3(4, k, n) ; if isprime(a) then RETURN(a) ; fi ; od: end: seq(A112748(n), n=1..20) ; # R. J. Mathar, Feb 08 2008
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Jan 02 2006
EXTENSIONS
More terms from R. J. Mathar, Feb 08 2008
STATUS
approved