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A106562
Perfect squares which are not the sum of two primes.
12
1, 121, 289, 529, 625, 961, 1521, 1681, 2025, 2601, 2809, 3249, 3481, 4225, 4489, 5329, 6241, 6561, 6889, 7225, 7569, 8281, 9025, 9409, 9801, 10201, 11025, 11881, 12321, 12769, 13225, 15129, 15625, 16641, 17689, 18769, 19881, 20449, 21609
OFFSET
1,2
FORMULA
A106544 with 0's removed.
EXAMPLE
a(2)=121 because it is the second perfect square which is impossible to obtain summing two primes.
100 is not in the sequence because 100=97+3 (sum of two primes).
KEYWORD
easy,nonn
AUTHOR
Alexandre Wajnberg, May 09 2005
EXTENSIONS
Extended by Ray Chandler, May 12 2005
STATUS
approved