A104491 Prime numbers n for which the square excess of the n-th prime is prime.

2, 5, 13, 19, 23, 37, 67, 71, 83, 107, 109, 113, 139, 157, 173, 199, 271

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Formula

n such that A102821(n) is prime. n such that A053186(A000040(n)) is an element of A000040.

Example

199 is an element of this sequence because 199 is prime and the 199th prime is 1217 and 1217 - 34^2 = 61 and 61 is prime, while 1217 - 35^2 = -8.

Crossrefs

Cf. A000040, A053186, A102821.

Sequence in context: A264737 A045364 A045365 * A038950 A019390 A073770

Adjacent sequences: A104488 A104489 A104490 * A104492 A104493 A104494

Keyword

easy,nonn

Author

Jonathan Vos Post, Mar 10 2005

Status

approved