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A115741 Semiprimes (A001358) whose digit reversal is a triangular number. 1
6, 10, 51, 55, 82, 87, 309, 501, 649, 694, 1198, 1207, 1473, 1765, 1803, 1837, 1959, 1981, 3043, 3057, 3561, 3574, 5158, 5221, 5721, 6139, 6193, 6267, 6535, 6711, 6814, 6843, 10473, 10497, 11553, 12477, 12693, 13123, 13701, 13951, 14169 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

EXAMPLE

51=3*17 is semiprime and 15=T(5).

CROSSREFS

Cf. A001358, A115742.

Sequence in context: A032359 A115917 A275004 * A177168 A136843 A219776

Adjacent sequences:  A115738 A115739 A115740 * A115742 A115743 A115744

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 31 2006

STATUS

approved

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Last modified June 28 20:39 EDT 2017. Contains 288840 sequences.