A090201 -id:A090201 - cp's OEIS frontend

A130144 Erroneous version of A090201.

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

Offset: 1

dead

A090204 a(n) = p-th digit of sqrt(2) where p = n-th prime.

Original entry on oeis.org

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

Offset: 2

Cino Hilliard, Jan 22 2004

The prime-th digits of sqrt(2).

Are the numbers in this sequence uniformly distributed? Could this sequence and A090201-A090203 be used as a random number generators?

			The 5th prime is 11. The 11th digit of sqrt(2) is 3, the 5th term in the sequence.

\primeth.gp primeth(n) = { default(realprecision,1000); p=Str(sqrt(2)*10^999); default(realprecision,28); forprime(x=2,n, print1(mid(p,x,1)",") ) } mid(str,s,n) = { v =""; tmp = Vec(str); ln=length(tmp); for(x=s,s+n-1, v=concat(v,tmp[x]); ); return(v) }

A160262 a(n)=c-th digit of A000796(n) where c=n-th composite.

Original entry on oeis.org

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

Offset: 1

Vladislav-Stepan Malakhovsky and Juri-Stepan Gerasimov, May 07 2009

A000796 is the decimal expansion of Pi.

Cf. A000796, A002808, A090201.

cp's OEIS Frontend

A130144 Erroneous version of A090201.

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A090204 a(n) = p-th digit of sqrt(2) where p = n-th prime.

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PARI

A160262 a(n)=c-th digit of A000796(n) where c=n-th composite.

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