A146316 Prime subtrahends of nearest squares producing prime differences.

2, 2, 5, 3, 2, 7, 5, 2, 11, 5, 3, 2, 17, 11, 3, 17, 13, 7, 5, 2, 23, 17, 5, 3, 2, 29, 23, 17, 5, 31, 17, 13, 11, 7, 2, 17, 11, 3, 2, 41, 23, 17, 5, 29, 19, 13, 7, 5, 29, 23, 17, 3, 2, 41, 23, 11, 2, 47, 43, 41, 37, 23, 19, 17, 13, 53, 47, 41, 11, 5, 3, 2, 59, 53, 47, 5, 3, 2, 67, 59, 47, 37

Offset: 1

Author

Enoch Haga, Oct 30 2008

Keywords

• easy
• nonn

Comments

Terms in A146315 + A146316 produce a square

Examples

			a(6)=7 because when the prime 29 is subtracted from the square 36, the result is another prime, 7
		

Crossrefs

A146315 A146317 A146318

Programs

UBASIC

10 'sq less pr are prime 20 N=1:O=1:C=1 30 A=3:S=sqrt(N) 40 B=N\A 50 if B*A=N then 120 60 A=A+2 70 if A<=S then 40 80 R=O^2:Q=R-N 90 if N31 then stop 120 N=N+2:if N