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A131807 Partial sums of A131377. 0
1, 2, 2, 3, 4, 4, 4, 5, 6, 7, 8, 8, 8, 9, 10, 11, 12, 12, 12, 13, 14, 15, 16, 16, 16, 16, 16, 16, 16, 17, 18, 18, 18, 18, 18, 18, 18, 19, 20, 21, 22, 22, 22, 23, 24, 25, 26, 26, 26, 26, 26, 26, 26, 27, 28, 29, 30, 31, 32, 32, 32, 33, 34, 35, 36, 37, 38, 38, 38, 38, 38, 39, 40, 40 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

MAPLE

P:=proc(n) local i, k, s; k:=1; s:=0; for i from 0 by 1 to n do if isprime(i) then if k=1 then k:=0; else k:=1; fi; fi; s:=s+k; print(s); od; end: P(100);

CROSSREFS

Cf. A131377.

Sequence in context: A066997 A006165 A078881 * A104351 A070172 A130128

Adjacent sequences:  A131804 A131805 A131806 * A131808 A131809 A131810

KEYWORD

easy,nonn

AUTHOR

Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Jul 18 2007

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Last modified February 15 09:26 EST 2012. Contains 205753 sequences.