A154521 - OEIS

A154521

The prime(n)-th digit of the concatenated positive nonprimes.

4, 6, 9, 0, 4, 5, 8, 0, 2, 6, 7, 2, 4, 5, 8, 2, 6, 8, 1, 4, 5, 8, 2, 5, 0, 4, 5, 7, 8, 1, 0, 2, 5, 6, 2, 0, 0, 1, 1, 4, 6, 1, 0, 2, 2, 2, 2, 3, 4, 3, 6, 0, 4, 4, 6, 8, 2, 5, 5, 6, 5, 1, 6, 9, 7, 1, 7, 8, 4, 8, 6, 8, 9, 9, 9, 0, 2, 0, 6, 0, 3, 1, 7, 1, 2, 1, 4, 2, 0, 3, 2, 7, 4, 3, 4, 7, 9, 4, 5, 6, 6, 8, 2, 4, 7

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

The digits of A129808 at prime indices.

LINKS

Table of n, a(n) for n=1..105.

FORMULA

a(n) = A129808(prime(n)) .

MAPLE

a129808 := [1] : for n from 4 to 400 do if not isprime(n) then a129808 := [op(a129808), op(ListTools[Reverse](convert(n, base, 10))) ] ; fi; od:

for n from 1 do p := ithprime(n) ; printf("%d, ", op(p, a129808) ) ; od: # R. J. Mathar, Aug 03 2009