A160656 The odd prime numbers together with 0: p - (-1)^p - 1 where p = n-th prime.

0, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277

Offset

1,2

Links

Table of n, a(n) for n=1..59.

Formula

a(n) = p - (-1)^p - 1 where p is the n-th prime.

a(n) = p mod n^2, where p is the n-th prime. - Gary Detlefs, Jan 14 2012

Maple

seq(ithprime(n) mod n^2, n=1..59) # Gary Detlefs, Jan 14 2012

Prog

(PARI) a(n)=if(n>1, prime(n)) \\ Charles R Greathouse IV, Aug 26 2011

Crossrefs

Cf. A000040, A006005, A158611.

Sequence in context: A073579 A006005 A065091 * A176997 A240699 A065380

Adjacent sequences: A160653 A160654 A160655 * A160657 A160658 A160659

Keyword

nonn,easy,less

Author

Juri-Stepan Gerasimov, May 23 2009

Status

approved