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A180006 Composite numbers that can be obtained from primes by interchanging the first and last digits. 1
91, 32, 92, 14, 34, 74, 35, 95, 16, 76, 38, 98, 301, 901, 721, 731, 931, 361, 371, 391, 791, 112, 322, 722, 922, 332, 932, 142, 152, 752, 362, 962, 172, 772, 182, 382, 392, 703, 713, 133, 943, 763, 973, 793, 104, 904, 914, 124, 134, 334, 934, 344, 944, 754 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The primes must contain at least two digits.

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

The composite number 752 is obtained from the prime 257 by interchanging the first and last digits.

CROSSREFS

The corresponding primes are A076056. Cf. A002808, A179826.

Sequence in context: A284439 A119656 A339141 * A259085 A033411 A329915

Adjacent sequences:  A180003 A180004 A180005 * A180007 A180008 A180009

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Aug 06 2010

EXTENSIONS

More terms from Vincenzo Librandi, Aug 06 2010

STATUS

approved

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Last modified September 24 02:52 EDT 2021. Contains 347620 sequences. (Running on oeis4.)