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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). 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

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

EXAMPLE

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

CROSSREFS

Cf. A037274, A050376, A084318.

Sequence in context: A037400 A080695 A239448 * A242799 A281588 A088865

Adjacent sequences:  A248710 A248711 A248712 * A248714 A248715 A248716

KEYWORD

nonn,base

AUTHOR

Vladimir Shevelev, Oct 12 2014

EXTENSIONS

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

STATUS

approved

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Last modified October 18 08:50 EDT 2018. Contains 316311 sequences. (Running on oeis4.)