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A115916 Numbers k such that sigma(k) + phi(k) 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
EXAMPLE
sigma(55112) + phi(55112) = 131819 = 193*683.
CROSSREFS
Sequence in context: A037441 A270436 A004869 * A065667 A099146 A073789
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved

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Last modified February 24 10:37 EST 2024. Contains 370294 sequences. (Running on oeis4.)