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A146315 Prime differences of primes subtracted from nearest square 5
2, 7, 11, 13, 23, 29, 31, 47, 53, 59, 61, 79, 83, 89, 97, 127, 131, 137, 139, 167, 173, 179, 191, 193, 223, 227, 233, 239, 251, 293, 307, 311, 313, 317, 359, 383, 389, 397, 439, 443, 461, 467, 479, 547, 557, 563, 569, 571, 647, 653, 659, 673, 727, 743, 761, 773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms in A146315 + A146316 produce a square

LINKS

Table of n, a(n) for n=1..56.

FORMULA

{p in A000040: A068527(p) in A000040}. - R. J. Mathar, Sep 26 2011

EXAMPLE

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

PROG

(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 N<R and N=prmdiv(N) and Q=prmdiv(Q) then print R; N; Q:N=N+2:C=C+1:goto 30 100 if C>31 then stop 120 N=N+2:if N<R then 30:else O=O+1:goto 80

CROSSREFS

Cf. A146316 - A146318.

Sequence in context: A140557 A027697 A235475 * A038892 A019346 A045369

Adjacent sequences:  A146312 A146313 A146314 * A146316 A146317 A146318

KEYWORD

easy,nonn

AUTHOR

Enoch Haga, Oct 30 2008

STATUS

approved

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Last modified June 29 10:17 EDT 2022. Contains 354913 sequences. (Running on oeis4.)