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A071388 Card[InvPhi(n)] is a prime number. 2
1, 2, 8, 10, 20, 22, 28, 30, 32, 44, 46, 48, 52, 54, 56, 58, 66, 70, 72, 78, 82, 92, 96, 102, 104, 106, 110, 116, 120, 126, 130, 132, 136, 138, 140, 148, 150, 156, 164, 166, 172, 178, 190, 196, 198, 204, 210, 212, 216, 220, 222, 226, 228, 238, 240, 250, 260, 262 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..58.

EXAMPLE

InvPhi[48]={65,104,105,112,130,140,144,156,168,180,210} has 11 terms, so 48 is here.

CROSSREFS

Cf. A000010, A014197, A058277, A063512, A071386-A071389.

Sequence in context: A294157 A082396 A195582 * A209202 A032356 A114272

Adjacent sequences:  A071385 A071386 A071387 * A071389 A071390 A071391

KEYWORD

nonn

AUTHOR

Labos Elemer, May 23 2002

STATUS

approved

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Last modified February 27 15:59 EST 2020. Contains 332307 sequences. (Running on oeis4.)