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A139564 Number of primes < 10^(2n) - sum of primes < 10^n. 2
0, 8, 169, 2371, 25059, 655974, 57509995, 1616756446, 28550646649, 442195486325, -2830020810398, 208945571225276 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

For 2n = 20, we get a negative value -2830020810398. This seems strange to me.

I emailed Marc Deleglise on this. The links shows the Pi(x) and SumP(x) values.

LINKS

Table of n, a(n) for n=0..11.

Cino Hilliard, Comparison of Pi(x^2) and SumP(x).

FORMULA

Pi(x) is the prime counting function or the number of primes <= x. SumP(x) = sum of primes <= x.

CROSSREFS

Cf. A046731, A000720, A006880.

Sequence in context: A254459 A254129 A084941 * A264113 A181198 A302802

Adjacent sequences:  A139561 A139562 A139563 * A139565 A139566 A139567

KEYWORD

sign

AUTHOR

Cino Hilliard, Jun 11 2008

STATUS

approved

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Last modified February 17 12:32 EST 2020. Contains 331996 sequences. (Running on oeis4.)