A116052 - OEIS

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A116052

Numbers k such that k + sigma(k) + sigma(sigma(k)) is a brilliant number (A078972).

2, 3, 57, 63, 64, 83, 85, 91, 98, 133, 141, 145, 149, 154, 156, 187, 189, 232, 247, 249, 255, 263, 279, 281, 293, 310, 319, 415, 419, 425, 467, 512, 575, 589, 593, 653, 791, 799, 813, 837, 839, 970, 1019, 1103, 1113, 1145, 1247, 1259, 1427, 2183, 2223

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

EXAMPLE

1103 is in the sequence since 1103 + sigma(1103) + sigma(sigma(1103)) = 71*73 (a brilliant number).

CROSSREFS

Cf. A078972 (brilliant numbers), A116051.

Sequence in context: A371227 A179281 A000656 * A141509 A054313 A080052

Adjacent sequences: A116049 A116050 A116051 * A116053 A116054 A116055

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 13 2006

STATUS

approved