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A071126
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Length of least repunit which is a multiple of the n-th prime, or 0 if no such multiple exists.
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5
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0, 3, 0, 6, 2, 6, 16, 18, 22, 28, 15, 3, 5, 21, 46, 13, 58, 60, 33, 35, 8, 13, 41, 44, 96, 4, 34, 53, 108, 112, 42, 130, 8, 46, 148, 75, 78, 81, 166, 43, 178, 180, 95, 192, 98, 99, 30, 222, 113, 228, 232, 7, 30, 50, 256, 262, 268, 5, 69, 28, 141, 146, 153, 155, 312, 79, 110
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Amarnath Murthy, On the divisors of Smarandache Unary Sequence. Smarandache Notions Journal, Vol. 11, 2000.
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LINKS
| P. De Geest, Repunits and Their Factors
A. A. A. Steward, Factorization of Repunits[up to R(196)]
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FORMULA
| If prime(n) = p then a(n) is a divisor of p-1. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 11 2002
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EXAMPLE
| The 13-th prime, 41, divides the repunit 11111, the smallest among all R(5k) which are multiples of 41.
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CROSSREFS
| Number of 1's in A077573(n).
Cf. A000042. Apart from a(2), identical to A002371.
Sequence in context: A007384 A171419 A077574 * A077187 A011079 A005928
Adjacent sequences: A071123 A071124 A071125 * A071127 A071128 A071129
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KEYWORD
| nonn
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), May 28 2002
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