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A104491
Prime numbers n for which the square excess of the n-th prime is prime.
0
2, 5, 13, 19, 23, 37, 67, 71, 83, 107, 109, 113, 139, 157, 173, 199, 271
OFFSET
1,1
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
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Mar 10 2005
STATUS
approved