A115665 - OEIS

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A115665

Brilliant numbers (A078972) whose digit reversal is a semiprime (A001358).

4, 6, 9, 15, 49, 121, 143, 169, 187, 221, 289, 319, 323, 341, 437, 493, 533, 551, 559, 589, 629, 667, 737, 767, 781, 817, 851, 871, 893, 899, 913, 923, 949, 961, 979, 989, 1027, 1067, 1079, 1121, 1219, 1247, 1273, 1343, 1357, 1387, 1411, 1513, 1577

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

EXAMPLE

551=19*29 is brilliant and 155=5*31 is semiprime.

CROSSREFS

Cf. A001358, A078972, A115666.

Sequence in context: A136357 A136356 A136358 * A118694 A085648 A300131

Adjacent sequences: A115662 A115663 A115664 * A115666 A115667 A115668

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 31 2006

STATUS

approved