OFFSET
1,29
LINKS
EXAMPLE
a(50)=4: 5=prime(3) -> 5+6=11=prime(5) -> 11+6=17=prime(7) ->
17+6=23=prime(9), 5=prime(3) -> 5+12=17=prime(7) -> 17+12=29=prime(10) ->
29+12=41=prime(13), 7=prime(4) -> 7+12=19=prime(8) -> 19+12=31=prime(11) ->
31+12=43=prime(14) and 11=prime(5) -> 11+6=17=prime(7) -> 17+6=23=prime(9)
-> 23+6=29=prime(10),
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Apr 28 2004
STATUS
approved