



2, 6, 6, 10, 14, 10, 10, 14, 14, 22, 26, 22, 26, 10, 30, 22, 26, 34, 30, 30, 30, 50, 42, 42, 46, 46, 50, 42, 42, 50, 46, 54, 42, 42, 42, 42, 38, 34, 30, 38, 14, 18, 18, 18, 46, 54, 62, 70, 78, 78, 90, 78, 66, 54, 70, 66, 62, 66, 58, 70, 66, 86, 98, 78, 78, 54, 70, 70, 78, 78
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

a(n) = A108546(2*n+1)  A108546(2*n).


LINKS

Ivan Neretin, Table of n, a(n) for n = 1..30000


MAPLE

A002144 := proc(n) option remember ; if n = 1 then RETURN(5) ; fi; for a from procname(n1)+2 do if isprime(a) and (a mod 4 = 1 ) then RETURN(a) ; fi; od: end; A002145 := proc(n) option remember ; if n = 1 then RETURN(3) ; fi; for a from procname(n1)+2 do if isprime(a) and (a mod 4 = 3 ) then RETURN(a) ; fi; od: end; A102261 := proc(n) A002144(n)A002145(n) ; end: seq(A102261(n), n=1..120) ; # R. J. Mathar, Feb 07 2009


MATHEMATICA

nmax = 70; a1 = Select[Range[1, Prime[3*nmax], 4], PrimeQ]; a3 = Select[Range[3, Prime[3*nmax], 4], PrimeQ]; a[n_] := a1[[n]]  a3[[n]]; Table[a[n], {n, 1, nmax}] (* JeanFrançois Alcover, Dec 17 2013 *)


CROSSREFS

Sequence in context: A196053 A063210 A114718 * A245486 A147298 A078636
Adjacent sequences: A102258 A102259 A102260 * A102262 A102263 A102264


KEYWORD

sign,look


AUTHOR

Paul Curtz, Sep 06 2008


EXTENSIONS

Edited by N. J. A. Sloane, Sep 06 2008
More terms from R. J. Mathar, Feb 07 2009


STATUS

approved



