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A091126 Number of primes of the form 8k+1 less than 10^n. 4
0, 5, 37, 295, 2384, 19552, 165976, 1439970, 12711220, 113758759, 1029502984, 9401951850, 86516283187, 801235071623 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Computed by T. D. Noe, Dec 19 2003.

LINKS

Table of n, a(n) for n=1..14.

Bernhard Helmes, Distribution of Primes

Eric Weisstein's World of Mathematics, Modular Prime Counting Function

MATHEMATICA

p = Select[Table[8 i + 1, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* Robert Price, May 28 2019 *)

CROSSREFS

Cf. A091127, A091128, A091129.

Sequence in context: A089303 A164595 A046636 * A066381 A078253 A006442

Adjacent sequences:  A091123 A091124 A091125 * A091127 A091128 A091129

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Dec 19 2003

EXTENSIONS

a(10) from Robert G. Wilson v, Dec 22 2003

a(11)-a(14) from Bernhard Helmes (pi(AT)devalco.de), Apr 21 2010

STATUS

approved

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Last modified July 12 18:03 EDT 2020. Contains 335666 sequences. (Running on oeis4.)