OFFSET
1,1
FORMULA
A106547 with 0's removed.
EXAMPLE
a(2)=289 because it is the second perfect square which is impossible to obtain adding a prime to - or subtracting from - another one. 64 is not in the sequence because 64=67-3, a difference of two primes.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Alexandre Wajnberg, May 09 2005
EXTENSIONS
Corrected and extended by Ray Chandler, May 12 2005
STATUS
approved