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A104192 a(n) = prime(n) - phi(n). 0
1, 2, 3, 5, 7, 11, 11, 15, 17, 25, 21, 33, 29, 37, 39, 45, 43, 55, 49, 63, 61, 69, 61, 81, 77, 89, 85, 95, 81, 105, 97, 115, 117, 123, 125, 139, 121, 145, 143, 157, 139, 169, 149, 173, 173, 177, 165, 207, 185, 209, 201, 215, 189, 233, 217, 239, 233, 243, 219, 265, 223 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..61.

MATHEMATICA

a== Table[Prime[n] - EulerPhi[n], {n, 1, 200}]

PROG

(PARI) a(n) = prime(n) - eulerphi(n);

CROSSREFS

Cf. A000010, A000040.

Sequence in context: A060264 A219429 A256457 * A290639 A262061 A104193

Adjacent sequences:  A104189 A104190 A104191 * A104193 A104194 A104195

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Mar 12 2005

STATUS

approved

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Last modified July 13 04:53 EDT 2020. Contains 335673 sequences. (Running on oeis4.)