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A204904
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p(n)-q(n), where (p(n), q(n)) is the least pair of odd primes for which n divides p(n)-q(n).
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1
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2, 2, 6, 4, 10, 6, 14, 8, 18, 10, 22, 12, 26, 14, 30, 16, 34, 18, 38, 20, 42, 22, 46, 24, 50, 26, 54, 28, 58, 30, 62, 32, 66, 34, 70, 36, 74, 38, 78, 40, 82, 42, 86, 44, 90, 46, 94, 48, 98, 50, 102, 52, 106, 54, 110, 56, 114, 58, 118, 60, 122, 62, 126, 64, 130
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OFFSET
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1,1
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COMMENTS
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This sequence agrees with A109043 for 0<n<=65; what about all larger n?
For a guide to related sequences, see A204892.
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LINKS
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EXAMPLE
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1 = (5-3)/2=(7-3)/4=(13-3)/6=(11-3)/8=...
2 = (5-3)/1=(11-5)/3=(7-3)/5=(17-3)/7=...
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MATHEMATICA
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PROG
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(PARI) a(n) = {forprime(p=5, , forprime(q=3, p-1, d = p-q; if ((d % n) == 0, return (d)); ); ); } \\ Michel Marcus, Mar 14 2018
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CROSSREFS
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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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