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A116040 n+phi(n)+phi(phi(n)) is a triangular number. +0
4
1, 3, 7, 16, 22, 23, 24, 46, 50, 54, 57, 67, 77, 81, 109, 135, 164, 204, 273, 304, 311, 331, 391, 415, 438, 500, 532, 541, 671, 685, 690, 702, 783, 855, 1025, 1130, 1264, 1301, 1375, 1459, 1603, 1667, 1707, 1775, 1864, 1953, 2053, 2055, 2136, 2369 (list; graph; listen)
OFFSET

1,2

EXAMPLE

77+phi(77)+phi(phi(77)) = 153 = T(17).

CROSSREFS

Cf. A115905, A116041, A116042, A116043.

Adjacent sequences: A116037 A116038 A116039 this_sequence A116041 A116042 A116043

Sequence in context: A060092 A035283 A004782 this_sequence A036666 A117491 A110585

KEYWORD

nonn

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.


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