1,1

W. Sierpi\'{n}ski, A Selection of Problems in the Theory of Numbers. Macmillan, NY, 1964, p. 108.

T. D. Noe, Table of n, a(n) for n = 1..10000

Sequence in context: A105882 A105912 A106085 this_sequence A022887 A063715 A105411

Adjacent sequences: A007487 A007488 A007489 this_sequence A007491 A007492 A007493

nonn

njas, Robert G. Wilson v (rgwv(AT)rgwv.com)