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A247872 Least prime factor of A247681(n). 1
5, 7, 5, 7, 5, 11, 17, 5, 7, 19, 5, 11, 7, 5, 13, 5, 11, 23, 5, 19, 7, 5, 13, 7, 5, 17, 5, 7, 13, 5, 23, 7, 5, 29, 17, 5, 11, 13, 5, 31, 7, 37, 19, 5, 11, 7, 5, 17, 5, 7, 11, 5, 29, 7, 5, 17, 11, 5, 31, 23, 41, 5, 13, 7, 5, 19, 7, 5, 13, 5, 7, 5, 23, 7, 5, 19, 11, 31, 5, 5, 7, 11, 5, 37, 7, 5, 47, 53, 11, 5, 7, 43, 13, 5, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Odimar Fabeny, Table of n, a(n) for n = 2..10000

MAPLE

count:= 0:

for n from 1 while count < 100 do

   m:= 1+18*n;

   if not isprime(m) then

      count:= count+1;

      A[count]:= min(numtheory:-factorset(m))

   fi

od:

seq(A[i], i=1..count); # Robert Israel, Sep 30 2014

CROSSREFS

Cf. A056608, A247681.

Sequence in context: A144567 A215732 A010718 * A306400 A090987 A278813

Adjacent sequences:  A247869 A247870 A247871 * A247873 A247874 A247875

KEYWORD

nonn,easy

AUTHOR

Odimar Fabeny, Sep 25 2014

STATUS

approved

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Last modified September 29 09:40 EDT 2020. Contains 337428 sequences. (Running on oeis4.)