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A198778
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Primes from merging of 4 successive digits in decimal expansion of Euler-Mascheroni constant A001620.
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11
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577, 421, 3359, 3593, 5939, 9923, 8677, 2677, 6709, 6947, 6329, 2917, 4951, 1447, 401, 4283, 2417, 6449, 5003, 3733, 3767, 7673, 9491, 2039, 853, 5323, 6211, 4793, 7937, 857, 7057, 29, 3547, 6043, 587, 6733, 7331, 3313, 1399, 7541, 5413, 4139, 8423, 4877, 503, 8431, 3109, 1093, 9973, 3613, 8893, 8933, 17, 7247
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OFFSET
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1,1
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COMMENTS
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In contrast to A104938, leading zeros are allowed here, which explains the terms having fewer than 4 digits; e.g., a(32)=29 comes from consecutive digits "...0029..." starting at the 268th decimal digit of gamma (if the initial "0." counts as the first digit). - M. F. Hasler, Oct 31 2011
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LINKS
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EXAMPLE
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The first four decimal digits of gamma = 0.5772... form the prime 577=a(1).
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MAPLE
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Digits := 420 ;
for sh from 3 do
p := floor(gamma*10^sh) mod 10000 ;
if isprime(p) then
printf("%d, ", p);
end if;
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MATHEMATICA
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Join[{577}, Select[FromDigits/@Partition[RealDigits[EulerGamma, 10, 1000][[1]], 4, 1], PrimeQ]] (* Harvey P. Dale, May 07 2019 *)
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PROG
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(PARI) L=10^4; for(i=3, 999, isprime(p=Euler\.1^i%L)&print1(p", ")) \\ M. F. Hasler, Oct 31 2011
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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