A091163 Number of primes of the form 12k + 7 less than 10^n.

1, 6, 44, 311, 2410, 19667, 166183, 1440496, 12711847, 113763697, 1029519042, 9401991443, 86516414220, 801235502231, 7461142589926, 69809586544290, 655889289734044, 6184988573835819, 58514416825612139

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Crossrefs

Cf. A091161 + A091162 + A091163 + A091164 +2 (for 2 & 3) = A006880.

Sequence in context: A380196 A091162 A156002 * A189800 A227665 A102591

Adjacent sequences: A091160 A091161 A091162 * A091164 A091165 A091166

Keyword

nonn,changed

Author

Robert G. Wilson v, Jan 12 2004

Extensions

a(11)-a(19) from Benjamin Chaffin, Jun 02 2026

a(19) corrected by Benjamin Chaffin, Jul 08 2026

Status

approved