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A008331 phi(p+1), p prime. 0
2, 2, 2, 4, 4, 6, 6, 8, 8, 8, 16, 18, 12, 20, 16, 18, 16, 30, 32, 24, 36, 32, 24, 24, 42, 32, 48, 36, 40, 36, 64, 40, 44, 48, 40, 72, 78, 80, 48, 56, 48, 72, 64, 96, 60, 80, 104, 96, 72, 88, 72, 64, 110, 72, 84, 80, 72, 128, 138, 92, 140, 84, 120, 96, 156, 104, 164, 156, 112, 120, 116 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..72.

MAPLE

for i from 1 to 500 do if isprime(i) then print(phi(i+1)); fi; od;

CROSSREFS

Cf. A000010.

Sequence in context: A134318 A104295 A172068 * A173388 A097196 A132325

Adjacent sequences:  A008328 A008329 A008330 * A008332 A008333 A008334

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 19 02:47 EDT 2013. Contains 225428 sequences.