id:A072344 - OEIS Search Results

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a(n) = the least natural number k such that k*phi(n) + 1 is prime.

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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 2, 1, 3, 1, 1, 1, 3, 1, 1, 1, 1, 2, 3, 1, 1, 1, 1, 2, 3, 3, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 2, 2, 1, 3, 2, 3, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 2, 1, 1, 3, 3, 1, 2, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 2, 2 (list; graph; listen)

	OFFSET	`1,15`
	EXAMPLE	`phi(35) = 24 and the least natural number k such that 24 k + 1 is prime is k = 3; so a(35) = 3.`
	MATHEMATICA	`f[n_] := Module[{i}, i = 0; While[ ! PrimeQ[i*EulerPhi[n] + 1], i++ ]; i]; Table[f[i], {i, 1, 150}]`
	CROSSREFS	`Sequence in context: A079674 A113193 A117898 this_sequence A140500 A156054 A030616` `Adjacent sequences: A072341 A072342 A072343 this_sequence A072345 A072346 A072347`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jul 16 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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