1,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. Simon and Schuster, NY, 1969, p. 189.

T. R. Parkin, personal communication.

Popular Computing, Vol. 1 (No. 7, 1973), front cover and page 2.

Illustration showing that a(3) = 37.

Bisection of A006067. Cf. A064941.

Adjacent sequences: A003210 A003211 A003212 this_sequence A003214 A003215 A003216

Sequence in context: A095957 A121834 A083846 this_sequence A166851 A090439 A089795

nonn,nice

N. J. A. Sloane (njas(AT)research.att.com).