A237359 a(n) is the largest integer that makes A237354(a(n))=n.

2, 3, 7, 23, 89, 389, 2297, 13903, 82829, 508847

Offset: 0

Author

Lei Zhou, Feb 06 2014

Keywords

• nonn
• hard
• more

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

Examples

			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.

Extensions

a(8) from Giovanni Resta, Feb 23 2014

a(9) from Hiroaki Yamanouchi, Oct 02 2014