1,2

Used to illustrate Besicovitch's density theorem.

Equals A171891 + A171892, where + denotes the usual sum of two sequences.

H. Halberstam and K. F. Roth, Sequences, Oxford, 1966; see p. 6.

Table of n, a(n) for n=1..70.

Index entries for linear recurrences with constant coefficients, signature (2,-1).

(PARI) a(n)=if(n<3, n, n+7) \\ Charles R Greathouse IV, Sep 02 2011

Sequence in context: A222638 A299982 A089601 * A278816 A043072 A165451

Adjacent sequences: A171890 A171891 A171892 * A171894 A171895 A171896

nonn,easy

N. J. A. Sloane, Oct 19 2010

approved