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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

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Last modified February 20 21:07 EST 2019. Contains 320348 sequences. (Running on oeis4.)