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A048849 a(n) = prime(phi(n)) + phi(prime(n)). 2
3, 4, 7, 9, 17, 15, 29, 25, 35, 35, 59, 43, 77, 55, 65, 71, 111, 73, 127, 89, 109, 107, 161, 107, 167, 137, 163, 143, 215, 131, 239, 183, 207, 191, 237, 187, 307, 223, 255, 225, 351, 217, 371, 263, 285, 277, 409, 275, 407, 299, 363, 327, 479 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

I made this up to demonstrate how easy it is to construct dull but unguessable sequences with short descriptions.

LINKS

Table of n, a(n) for n=0..52.

MAPLE

with(numtheory); [ seq(ithprime(phi(i))+phi(ithprime(i)), i=1..80) ];

CROSSREFS

Cf. A048848.

Sequence in context: A086336 A237258 A108796 * A076211 A167186 A221212

Adjacent sequences:  A048846 A048847 A048848 * A048850 A048851 A048852

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified May 28 17:37 EDT 2020. Contains 334684 sequences. (Running on oeis4.)