A033920 Largest proper substring of n-th prime that is prime (0 if none).

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

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