A264724 a(n) = n^2 + phi(n).

2, 5, 11, 18, 29, 38, 55, 68, 87, 104, 131, 148, 181, 202, 233, 264, 305, 330, 379, 408, 453, 494, 551, 584, 645, 688, 747, 796, 869, 908, 991, 1040, 1109, 1172, 1249, 1308, 1405, 1462, 1545, 1616, 1721, 1776, 1891, 1956, 2049, 2138, 2255, 2320, 2443, 2520

Offset

1,1

Links

Table of n, a(n) for n=1..50.

Formula

a(n) = A000290(n) + A000010(n).

Example

a(5) = 29, because phi(5) = 4 and 5^2 + 4 = 29.

Mathematica

Table[n^2 + EulerPhi[n], {n, 50}]

Prog

(Magma) [n^2+EulerPhi(n): n in [1..50]];
(PARI) a(n) = n^2 + eulerphi(n); \\ Altug Alkan, Nov 24 2015

Crossrefs

Cf. A000010, A000290, A258434.

Sequence in context: A169745 A171769 A025200 * A298375 A260037 A132455

Adjacent sequences: A264721 A264722 A264723 * A264725 A264726 A264727

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 24 2015

Status

approved