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1,1

The integer square root of an integer x >= 0 can be defined as floor(sqrt(x)) and the remainder of this as x - (floor(sqrt(x)))^2.

Table of n, a(n) for n=1..55.

Wikipedia, Integer square root

(PARI) { forprime(p=2, 2000, isr = sqrtint(p); Rem = p - isr*isr; if (!isprime(Rem), print1(p, ", ") ) ) }

Sequence in context: A019362 A075451 A109515 * A086807 A002313 A233346

Adjacent sequences: A135930 A135931 A135932 * A135934 A135935 A135936

nonn

Harry J. Smith, Dec 07 2007

approved