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A237359
a(n) is the largest integer that makes A237354(a(n))=n.
0
2, 3, 7, 23, 89, 389, 2297, 13903, 82829, 508847
OFFSET
0,1
COMMENTS
a(0)-a(7) are primes, while a(8) = 113*733. Probably, a(9) = 508847 and a(10) = 3699977. - Giovanni Resta, Feb 23 2014
Probably, a(11) = 28644529 and a(12) = 235037603. - Hiroaki Yamanouchi, Oct 02 2014
EXAMPLE
A237354(2)=0 and this is the only 0 in A237354. So a(0)=2;
A237354(3)=1 and this is the only 1 in A237354. So a(1)=3;
A237354(4,5,6,7)=2, the largest one is A237354(7). So a(2)=7;
There are 10 numbers between (include) 8 and 23 that make A237354(n)=3. The largest one is 23. There is no more A237354(n)=3 checked up to n=2*3*5+1=31. So a(3)=23;
Checked up to n=2*3*5*7+1=211, we got a(4)=89;
Checked up to n=2*3*5*7*11+1=2311, we got a(5)=389;
Checked up to n=2*3*5*7*11*13+1=30031, we got a(6)=2297;
CROSSREFS
Cf. A237354.
Sequence in context: A256454 A133429 A087770 * A087164 A077213 A112601
KEYWORD
nonn,hard,more
AUTHOR
Lei Zhou, Feb 06 2014
EXTENSIONS
a(8) from Giovanni Resta, Feb 23 2014
a(9) from Hiroaki Yamanouchi, Oct 02 2014
STATUS
approved