id:A063474 - OEIS Search Results

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Half totient of 2^n+1.

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1, 2, 3, 8, 10, 24, 42, 128, 162, 400, 682, 1920, 2730, 6272, 9900, 32768, 43690, 93312, 174762, 493440, 682668, 1672704, 2796202, 8257536, 10125000, 26153088, 42384060, 126322560, 175923744, 380160000, 715827882, 2144133120 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=A023022[A000051(n)]`
	PROGRAM	`(PARI) H(n)=eulerphi(n)/2; j=[]; for(n=1, 40, j=concat(j, H(2^n+1))); j`
	CROSSREFS	`Cf. A023022, A000051.` `Sequence in context: A098844 A034437 A138880 this_sequence A025562 A107401 A121989` `Adjacent sequences: A063471 A063472 A063473 this_sequence A063475 A063476 A063477`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 27 2001`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research