A091161 Number of primes of the form 12k + 1 less than 10^n.

0, 5, 36, 300, 2374, 19564, 166011, 1440021, 12710866, 113759426, 1029499626, 9401942077, 86516277793, 801235243343, 7461141882222, 69809582471396, 655889285423469, 6184988556988150, 58514406887275217

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: A027331 A357153 A255489 * A390780 A388532 A364765

Adjacent sequences: A091158 A091159 A091160 * A091162 A091163 A091164

Keyword

nonn

Author

Robert G. Wilson v, Jan 12 2004

Extensions

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

Status

approved