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 A146758 Last prime subtrahend at 10^n in A146757. 2
 7, 97, 983, 9941, 99839, 999983, 9998239, 99999989, 999950881, 9999999929, 99999999833, 999999999989, 9999999999863, 99999999999971, 999999961946087, 9999999999999917, 99999999989350667, 999999999999999989 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..18. EXAMPLE A(2)=97 because 97 is the 15th and last prime difference under 10^2. MAPLE A146758 := proc(n) local p: p:=10^n: do p:=prevprime(p): if(isprime(ceil(evalf(sqrt(p)))^2-p))then return p: fi: od: end: seq(A146758(n), n=1..14); # Nathaniel Johnston, Oct 01 2011 PROG (UBASIC) 10 'sq less pr are prime 20 N=1:O=1:C=1 30 A=3:S=sqrt(N):if N>10^3 then print N, C-1:stop 40 B=N\A 50 if B*A=N then 100 60 A=A+2 70 if A<=S then 40 80 R=O^2:Q=R-N 90 if N1 print R; N; Q; C:N=N+2:C=C+1:goto 30 100 N=N+2:if N

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Last modified December 3 18:21 EST 2023. Contains 367540 sequences. (Running on oeis4.)