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a(n) is the smallest k such that A278478(k) = n.
Next term > 10^9.
Table of n, a(n) for n=0..28.
Joerg Arndt, C++ program for this sequence
Sequence in context: A292359 A035420 A241202 * A022375 A072663 A276176
Adjacent sequences: A278476 A278477 A278478 * A278480 A278481 A278482
Joerg Arndt, Nov 23 2016