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 A088755 Number of n-digit 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 (list; graph; refs; listen; history; text; internal format)
 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 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

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Last modified February 22 18:10 EST 2024. Contains 370260 sequences. (Running on oeis4.)