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

Author

Vincenzo Librandi, Nov 24 2015

Keywords

• nonn
• easy

Examples

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

Crossrefs

Cf. A000010, A000290, A258434.

Programs

Magma

[n^2+EulerPhi(n): n in [1..50]];

Mathematica

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

PARI

a(n) = n^2 + eulerphi(n); \\ Altug Alkan, Nov 24 2015

Formula

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