

A088755


Number of ndigit primes beginning with n.


5



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


CROSSREFS

Cf. A077504, A077505, A088104, A088105, A088754.
Sequence in context: A288964 A193289 A159324 * A136782 A112710 A046105
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



