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 A211455 The number of bases b for which A181780(n) is a Fermat pseudoprime. 5
 2, 2, 2, 2, 2, 2, 2, 6, 4, 2, 2, 2, 2, 2, 14, 4, 2, 2, 2, 2, 2, 14, 2, 34, 2, 2, 2, 14, 2, 2, 2, 6, 2, 8, 2, 2, 2, 2, 2, 34, 2, 2, 2, 14, 2, 2, 14, 2, 2, 2, 2, 14, 10, 2, 2, 10, 4, 2, 2, 14, 4, 2, 2, 8, 6, 2, 2, 2, 14, 2, 2, 2, 2, 2, 34, 2, 14, 6, 38, 6, 2, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequences A211456 and A211457 give the smallest and largest bases b; A211458 lists all bases. LINKS T. D. Noe, Table of n, a(n) for n = 1..10000 MATHEMATICA t = {}; n = 1; While[Length[t] < 100, n++; If[! PrimeQ[n], s = Select[Range[2, n-2], PowerMod[#, n-1, n] == 1 &]; If[s != {}, AppendTo[t, {n, Length[s], s}]]]]; Transpose[t][[2]] CROSSREFS Cf. A181780, A211456, A211457, A211458. Sequence in context: A105267 A008838 A063790 * A214079 A202742 A109913 Adjacent sequences:  A211452 A211453 A211454 * A211456 A211457 A211458 KEYWORD nonn AUTHOR T. D. Noe, Apr 13 2012 STATUS approved

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