

A175038


In the sequence of positive integers A000027, number of digits between successive primes.


2



0, 1, 1, 4, 2, 6, 2, 6, 10, 2, 10, 6, 2, 6, 10, 10, 2, 10, 6, 2, 10, 6, 10, 14, 7, 3, 9, 3, 9, 39, 9, 15, 3, 27, 3, 15, 15, 9, 15, 15, 3, 27, 3, 9, 3, 33, 33, 9, 3, 9, 15, 3, 27, 15, 15, 15, 3, 15, 9, 3, 27, 39, 9, 3, 9, 39, 15, 27, 3, 9, 15, 21, 15, 15, 9, 15, 21, 9, 21, 27, 3, 27, 3, 15, 9, 15
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OFFSET

1,4


COMMENTS

For example m=1, n=24 then a(n)=7*2=14.
For example m=2, n=26 then a(n)=1*3=3.
For example m=1, n=25 then a(n)=3*2+1=7.
(End)


LINKS



EXAMPLE

a(4) = 4 as prime(4) = 7 and prime(4+1) = 11 so the number of digits between these two primes is the number of digits of 8, 9 and 10. These numbers have 4 digits combined. Therefore a(4) = 4.  David A. Corneth, Jan 30 2019


MATHEMATICA

Table[Length[Flatten[IntegerDigits/@Range[Prime[n]+1, Prime[n+1]1]]], {n, 200}]


PROG

(PARI) a(n) = sum(k=prime(n)+1, prime(n+1)1, #Str(k)); \\ Michel Marcus, Jan 30 2019


CROSSREFS



KEYWORD

base,nonn


AUTHOR



STATUS

approved



