A185711 a(n) = number of primes <= n that end in 1.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6

Offset

1,31

Comments

Partial sums of A185705.

Links

G. C. Greubel, Table of n, a(n) for n = 1..5000

A. Granville and G. Martin, Prime number races, arXiv:math/0408319 [math.NT], 2004.

A. Granville and G. Martin, Prime number races, Amer. Math. Monthly, 113 (No. 1, 2006), 1-33.

Mathematica

Accumulate[Table[If[PrimeQ[n]&&Mod[n, 10]==1, 1, 0], {n, 120}]] (* Harvey P. Dale, May 30 2016 *)

Crossrefs

Cf. A185705, A185706, A185708, A185709, A185711, A185712, A185714, A185715.

Sequence in context: A262303 A127321 A111897 * A185712 A328499 A339183

Adjacent sequences: A185708 A185709 A185710 * A185712 A185713 A185714

Keyword

base,nonn

Author

N. J. A. Sloane, Feb 10 2011

Status

approved