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A171893
1, 2 and all numbers >= 10.
0
1, 2, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77
OFFSET
1,2
COMMENTS
Used to illustrate Besicovitch's density theorem.
Equals A171891 + A171892, where + denotes the usual sum of two sequences.
REFERENCES
H. Halberstam and K. F. Roth, Sequences, Oxford, 1966; see p. 6.
PROG
(PARI) a(n)=if(n<3, n, n+7) \\ Charles R Greathouse IV, Sep 02 2011
CROSSREFS
Sequence in context: A299982 A367638 A089601 * A278816 A043072 A165451
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Oct 19 2010
STATUS
approved