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Search: id:A085378
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| A085378 |
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Difference between primes p and the largest prime divisor of p-1. |
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+0
1
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| 3, 4, 6, 10, 15, 16, 12, 22, 26, 34, 36, 36, 24, 40, 30, 56, 56, 64, 70, 66, 42, 78, 94, 96, 86, 54, 106, 106, 120, 118, 120, 116, 112, 146, 144, 160, 84, 130, 90, 176, 172, 190, 190, 188, 204, 186, 114, 210, 204, 222, 236, 246, 255, 132, 202, 266, 254, 274, 236
(list; graph; listen)
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OFFSET
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5,1
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COMMENT
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This sequence contains only one prime number = 3. All other numbers are even.
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EXAMPLE
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For prime 107 we have 107 - 53 = 54
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PROGRAM
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(PARI) cminuspm1(n) = \ prime - maxprime of prime-1 { forprime(x=5, n, forstep(p=x, 2, -1, if(isprime(p) & (x-1)%p==0, print1(x-p, ", "); break); ) ) }
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CROSSREFS
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Adjacent sequences: A085375 A085376 A085377 this_sequence A085379 A085380 A085381
Sequence in context: A113887 A103000 A074321 this_sequence A125869 A059618 A114736
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Aug 12 2003
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