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A135580 Largest prime visible as a substring of 10n+3. 1
3, 13, 23, 3, 43, 53, 3, 73, 83, 3, 103, 113, 23, 13, 43, 53, 163, 173, 83, 193, 3, 13, 223, 233, 43, 53, 263, 73, 283, 293, 3, 313, 23, 3, 43, 353, 3, 373, 383, 3, 3, 41, 23, 433, 443, 53, 463, 73, 83, 3, 503, 13, 523, 53, 43, 53, 563, 73, 83, 593, 3, 613, 23, 3, 643, 653, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..66.

EXAMPLE

a(0)=3 because 10*0+3=3 (prime),

a(1)=13 because 10*1+3=13 (prime),

a(3)=3 because 10*3+3=33 (composite)=>3 (prime),

a(78)=83 because 10*78+3=783 (composite) =>83 (prime).

CROSSREFS

Sequence in context: A057589 A299645 A180970 * A166566 A011533 A277965

Adjacent sequences:  A135577 A135578 A135579 * A135581 A135582 A135583

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Feb 24 2008

STATUS

approved

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Last modified April 20 02:06 EDT 2019. Contains 322291 sequences. (Running on oeis4.)