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Probably finite. No other terms up to 10^9.
Table of n, a(n) for n=1..14.
Cf. A022552, A014158, A115159, A115160, A115161, A115163.
Sequence in context: A227116 A180742 A039904 * A278977 A097433 A110078
Adjacent sequences: A115159 A115160 A115161 * A115163 A115164 A115165
Giovanni Resta, Jan 15 2006