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A115916 Numbers n such that sigma(n)+phi(n) is a brilliant number (A078972). 3
2, 3, 4, 5, 6, 7, 128, 144, 400, 576, 1296, 8100, 11664, 13225, 15129, 34969, 40000, 44944, 55112, 60025, 63368, 67712, 69938, 91809, 103058, 135424, 157922, 203401, 861184, 1034289, 1258884, 1270418, 1435204, 1440000, 1575025 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..35.

EXAMPLE

sigma(55112)+phi(55112)=131819=193*683.

CROSSREFS

Cf. A078972, A115914, A115915.

Sequence in context: A037441 A270436 A004869 * A065667 A099146 A073789

Adjacent sequences:  A115913 A115914 A115915 * A115917 A115918 A115919

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified November 21 00:11 EST 2019. Contains 329348 sequences. (Running on oeis4.)