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A106574
Indices n of perfect squares n^2 which are neither the sum nor the difference of two primes.
2
11, 17, 23, 25, 31, 41, 51, 53, 59, 65, 67, 73, 79, 83, 85, 87, 91, 95, 97, 101, 109, 113, 115, 125, 129, 133, 137, 141, 143, 149, 151, 153, 157, 159, 163, 165, 167, 175, 179, 181, 185, 187, 189, 193, 195, 197, 199, 201, 203, 207, 209, 213, 215, 221, 227, 229
OFFSET
1,1
FORMULA
a(n) = sqrt(A106573(n)).
EXAMPLE
a(2)=17 because the second square which is nor the sum nor the difference of two primes (289=17^2) is the 17th one in the succession of the perfect squares (thus: index 17).
KEYWORD
easy,nonn
AUTHOR
Alexandre Wajnberg, May 09 2005
EXTENSIONS
Corrected and extended by Ray Chandler, May 12 2005
STATUS
approved