A215030 a(n) = A215029(A000040(n)), where A000040(n) is the n-th prime.

2, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 1, 2, 1, 2, 1, 0, 1, 2, 1, 0, 1, 0, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 2, 1, 2, 1, 0, 1, 2, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 1, 2, 1, 2, 1, 2, 1, 0, 1, 2

Offset: 1

Author

N. J. A. Sloane, Aug 05 2012

Keywords

• nonn

Comments

For primes whose value is 0, see A214912; for value 1 see A031215; and for value 2 see A215031.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000
• StackExchange, A prime number pattern, Jul 29 2012.

Crossrefs

Cf. A000040, A215029, A214912, A031215, A215031, A215032, A215033, A215034, A215035.

Programs

PARI

A215029(n) = if(n<=2,n,my(mp=precprime(n-1),d=n); while(mp>0, if(d>0, d -= mp, d += mp); mp = precprime(mp-1)); (d));
A215030(n) = A215029(prime(n)); \\ Antti Karttunen, Nov 28 2018