2,1
A. H. Beiler, Recreations in the Theory of Numbers, Dover, NY, 1964, p. 42.
Sequence in context: A035750 A107546 A076748 this_sequence A025335 A025327 A101852
Adjacent sequences: A057595 A057596 A057597 this_sequence A057599 A057600 A057601
dead
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