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A321018 a(n) = round(pi(n)/2). 1
0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

More terms than usual are displayed in order to distinguish this from neighboring sequences.

LINKS

Table of n, a(n) for n=1..100.

CROSSREFS

Cf. A000720, A321017.

Suggested by A321005.

Sequence in context: A321017 A138194 A133876 * A340764 A152467 A242602

Adjacent sequences:  A321015 A321016 A321017 * A321019 A321020 A321021

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 09 2018

STATUS

approved

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Last modified June 25 06:20 EDT 2021. Contains 345452 sequences. (Running on oeis4.)