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

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

Crossrefs

Cf. A000040, A154513, A154520.

Sequence in context: A198733 A010478 A106146 * A129112 A239634 A175013

Adjacent sequences: A154518 A154519 A154520 * A154522 A154523 A154524

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Jan 11 2009

Extensions

Edited and corrected by R. J. Mathar, Aug 03 2009

Status

approved