login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
A033920
Largest proper substring of n-th prime that is prime (0 if none).
0
0, 0, 0, 0, 0, 3, 7, 0, 3, 2, 3, 7, 0, 3, 7, 5, 5, 0, 7, 7, 7, 7, 3, 0, 7, 0, 3, 7, 0, 13, 7, 31, 37, 13, 0, 5, 7, 3, 67, 73, 79, 0, 19, 19, 97, 19, 11, 23, 7, 29, 23, 23, 41, 5, 7, 3, 2, 71, 7, 2, 83, 29, 7, 31, 31, 31, 31, 37, 47, 3, 53, 59, 67, 73, 79, 83, 89, 97, 0, 0, 41, 2, 43, 43, 43
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,6
LINKS
Table of n, a(n) for n=1..85.
EXAMPLE
p(16)=53, largest prime substring is 5, so a(16)=5.
CROSSREFS
See
A033274
for the 'no prime substring' sequence.
Sequence in context:
A181913
A127584
A124919
*
A005600
A180873
A021031
Adjacent sequences:
A033917
A033918
A033919
*
A033921
A033922
A033923
KEYWORD
nonn
,
base
AUTHOR
N. J. A. Sloane
EXTENSIONS
More terms from
Patrick De Geest
, Jun 15 1998
STATUS
approved