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A071839 Number of primes == 1 mod 8 <= n. 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,41

LINKS

Table of n, a(n) for n=1..105.

PROG

(PARI) for(n=1, 200, print1(sum(i=1, n, if((i*isprime(i)-1)%8, 0, 1)), ", "))

CROSSREFS

Sequence in context: A225541 A076303 A242253 * A235044 A163857 A185715

Adjacent sequences:  A071836 A071837 A071838 * A071840 A071841 A071842

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jun 08 2002

STATUS

approved

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)