A248713 a(1)=1; starting with n>1, concatenate distinct divisors which are in A050376 in increasing order and repeat until a term of A050376 is reached (a(n)=0 if no term of A050376 is ever reached).

1, 2, 3, 4, 5, 23, 7, 731173, 9, 25, 11, 31397, 13, 313, 1129, 16, 17, 29, 19, 59, 37, 211, 23, 731173, 25, 3251, 313, 47, 29, 547, 31, 313289, 311, 31397, 1129, 49, 37, 373, 313, 961, 41, 379, 43, 3137, 59, 223, 47, 479, 49, 71443, 317, 31123, 53, 239, 773

Offset: 1

Author

Vladimir Shevelev, Oct 12 2014

Keywords

• nonn
• base

Comments

Fermi-Dirac analog of A037274 (terms of A050376 are Fermi-Dirac primes).

Examples

			We have 40 = 2*4*5 -> 245 = 5*49 -> 549 = 9*61 -> 961 is in A050376. So a(40) = 961.
		

Links

• Hiroaki Yamanouchi, Table of n, a(n) for n = 1..100

Crossrefs

Cf. A037274, A050376, A084318.

Extensions

a(8) and a(34) corrected by Hiroaki Yamanouchi, Oct 13 2014