1,1
phi(72)=pi(78)=phi(84)=phi(90)=24, so 72 is in the sequence.
Cf. A000010, A039670.
Sequence in context: A044785 A028977 A033693 this_sequence A077535 A064716 A073412
Adjacent sequences: A050495 A050496 A050497 this_sequence A050499 A050500 A050501
nonn
Jud McCranie (j.mccranie(AT)comcast.net), Dec 27 1999
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