The On-Line Encyclopedia of Integer Sequences (OEIS)

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Revision History for A049454

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A049454

a(n) = 1 + Sum_{i=1..n} phi(i)^2.
(history; published version)

#2 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

#1 by N. J. A. Sloane at Sat Dec 11 03:00:00 EST 1999

NAME

1+Sum_{i=1..n} phi(i)^2.

DATA

1, 2, 3, 7, 11, 27, 31, 67, 83, 119, 135, 235, 251, 395, 431, 495, 559, 815, 851, 1175, 1239, 1383, 1483, 1967, 2031, 2431, 2575, 2899, 3043, 3827, 3891, 4791, 5047, 5447, 5703, 6279, 6423, 7719, 8043, 8619, 8875, 10475, 10619, 12383

OFFSET

0,2

CROSSREFS

Cf. A005728.

KEYWORD

nonn

AUTHOR

njas

STATUS

approved