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A320702
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Indices of primes followed by a gap (distance to next larger prime) of 8.
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21
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24, 72, 77, 79, 87, 92, 94, 124, 126, 128, 132, 135, 156, 158, 166, 186, 192, 196, 220, 228, 241, 246, 248, 270, 281, 299, 304, 325, 330, 334, 338, 364, 370, 379, 386, 393, 400, 413, 417, 421, 432, 436, 454, 456, 482, 488, 507, 517, 519, 538, 589, 594, 620, 640, 661, 676, 689, 691, 712, 736, 750, 759
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OFFSET
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1,1
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COMMENTS
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Indices of the primes given in A031926.
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LINKS
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FORMULA
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MAPLE
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p:= 2: Res:= NULL: count:= 0:
for n from 1 while count < 100 do
q:= nextprime(p);
if q-p = 8 then count:= count+1; Res:= Res, n; fi;
p:= q;
od:
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MATHEMATICA
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Select[Range[800], Prime[#] + 8 == Prime[# + 1] &] (* Vincenzo Librandi, Mar 21 2019 *)
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PROG
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(PARI) A_vec(N=100, g=8, p=2, i=primepi(p)-1, L=List())={forprime(q=1+p, , i++; if(p+g==p=q, listput(L, i); N--||break)); Vec(L)}
(Magma) [n: n in [1..800] | NthPrime(n+1) - NthPrime(n) eq 8]; // Vincenzo Librandi, Mar 21 2019
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CROSSREFS
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Cf. A029707, A029709, A320701, A320703, ..., A320720 (analog for gaps 2, 4, 6, 10, ..., 44), A116493 (gap 70), A116496 (gap 100), A116497 (gap 200), A116495 (gap 210).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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