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 A119295 Total number of 4's digits in the first 10^n primes. 6
 0, 27, 311, 3919, 47647, 628061, 7098709, 79587350, 888504625, 10169426048, 110936566287, 1199775766812 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..12. EXAMPLE At a(2)=27 there are 27 4's digits in the first 10^2 primes. MAPLE A119295 := proc(n) option remember: local k, s, lim: if(n=0)then return 0:fi: lim:=10^n: s:=procname(n-1): for k from 10^(n-1)+1 to lim do s:=s+nops([SearchAll("4", convert(ithprime(k), string))]): od: return s: end: seq(A119295(n), n=1..4); # Nathaniel Johnston, May 09 2011 MATHEMATICA Accumulate@Table[c = 0; For[i = 10^(n - 1) + 1, i <= 10^n, i++, c += Count[IntegerDigits[Prime[i]], 4]]; c, {n, 6}] (* Robert Price, Jun 09 2019 *) CROSSREFS Cf. A119290, A119291-A119294, A119296-A119300. Sequence in context: A086574 A274832 A125415 * A048396 A061181 A231911 Adjacent sequences: A119292 A119293 A119294 * A119296 A119297 A119298 KEYWORD more,nonn,base AUTHOR Enoch Haga, May 13 2006 EXTENSIONS Offset changed from 0 to 1 by Nathaniel Johnston, May 09 2011 a(8)-a(11) from Robert Price, Nov 05 2013 a(12) from Marek Hubal, Mar 04 2019 STATUS approved

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Last modified August 2 19:53 EDT 2024. Contains 374875 sequences. (Running on oeis4.)