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A114781
A114780(n)/(2n-1).
1
2, 1, 1, 1, 79, 83, 9, 0, 19, 91, 11, 19, 0, 9, 43, 63, 23, 0, 91, 89, 53, 53, 0, 87, 53, 551, 851, 0, 37, 307, 707, 637, 0, 17, 321, 481, 509, 0, 171, 787, 459, 207, 0, 439, 373, 189, 927, 0, 291, 871, 933, 313, 0, 993, 773, 633, 613, 0, 481, 599, 523, 791, 0, 593, 297
OFFSET
1,1
PROG
(PARI) a(n) = {if (((n >=8) && ((n-8) % 5 == 0)), return (0)); k = 1; tn = 2*n-1; p = prime(n); tp = 10^length(Str(p)); while ((k*tn) % tp != p, k++); return (k); } \\ Michel Marcus, Sep 15 2013
CROSSREFS
Cf. A114780.
Sequence in context: A105816 A329334 A062979 * A083890 A000989 A132401
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 17 2005
EXTENSIONS
More terms from Joshua Zucker, May 05 2006
STATUS
approved