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A177692
The even values of PrimePi(.), with repetition.
0
0, 2, 2, 4, 4, 4, 4, 6, 6, 6, 6, 8, 8, 8, 8, 10, 10, 12, 12, 12, 12, 14, 14, 14, 14, 16, 16, 16, 16, 16, 16, 18, 18, 18, 18, 18, 18, 20, 20, 22, 22, 22, 22, 24, 24, 24, 24, 24, 24, 24, 24, 26, 26, 28, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 32, 32, 32, 32, 32
OFFSET
1,2
FORMULA
Obtained by removing all odd numbers from A000720. Block lengths (frequencies of repetitions) are in A088680.
CROSSREFS
Sequence in context: A001670 A100144 A076222 * A098667 A279506 A105678
KEYWORD
nonn,easy
AUTHOR
Giovanni Teofilatto, May 11 2010
EXTENSIONS
Erroneous formula removed by R. J. Mathar, May 14 2010
STATUS
approved