A088755 Number of n-digit primes beginning with n.

0, 2, 16, 119, 924, 7445, 63129, 547572, 4838319, 4814936, 43167234, 391378851, 3580266494, 32997926272, 306051434210, 2853931339135, 26737370196938, 251515351394258, 2374493400086829, 22488661383368556, 213597279448646179, 2033961812788210675, 19413250431142245897

Offset

1,2

Comments

This is a subsidiary sequence suggested in A088104.

Links

Table of n, a(n) for n=1..23.

Tomás Oliveira e Silva, Tables of values of pi(x) and of pi2(x)

Example

a(2) = 2 since 23 and 29 are the only two 2-digit primes beginning with 2.

Crossrefs

Cf. A077504, A077505, A088104, A088105, A088754.

Sequence in context: A288964 A193289 A159324 * A136782 A370621 A112710

Adjacent sequences: A088752 A088753 A088754 * A088756 A088757 A088758

Keyword

nonn,base

Author

Ray Chandler, Oct 15 2003

Extensions

More terms from Harvey P. Dale, Oct 16 2003

a(10)-a(13) corrected and a(14)-a(22) from Donovan Johnson, Apr 24 2013

Incorrect Mathematica program deleted by Harvey P. Dale, Apr 25 2013

a(23) from Chai Wah Wu, Jun 20 2019

Status

approved