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A185174 Number of primes less than the n-th perfect number. 0
3, 9, 94, 1022, 2063449, 393612920, 5586492151, 55890484019689268 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..8.
Chris K. Caldwell and G. L. Honaker,Jr., Prime Curios!
Chris K. Caldwell, Perfect Number
CROSSREFS
Cf. A000040, A000396, A000720.
Sequence in context: A237355 A007663 A231212 * A018695 A250302 A156336
Adjacent sequences: A185171 A185172 A185173 * A185175 A185176 A185177
KEYWORD
nonn,more,hard
AUTHOR
G. L. Honaker, Jr., Feb 28 2012
EXTENSIONS
a(8) from Giovanni Resta, Nov 19 2019
STATUS
approved

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Last modified August 28 08:02 EDT 2024. Contains 375477 sequences. (Running on oeis4.)