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A101787 |S(n)| where S(n) = {i : 1 <= i <= n and 4n-1 and 8n-1 are primes}. 1
1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Number of Lucasian primes less than n.

LINKS

Table of n, a(n) for n=1..94.

CROSSREFS

Cf. A002515, A101788.

Sequence in context: A192688 A156752 A086673 * A269024 A244160 A064099

Adjacent sequences:  A101784 A101785 A101786 * A101788 A101789 A101790

KEYWORD

easy,nonn

AUTHOR

Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 16 2004

STATUS

approved

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Last modified October 18 22:03 EDT 2019. Contains 328211 sequences. (Running on oeis4.)