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A109309 Larger emirps (primes whose digit reversal is a lesser prime). 6
31, 71, 73, 97, 311, 701, 733, 743, 751, 761, 907, 937, 941, 953, 967, 971, 983, 991, 1201, 1301, 1321, 1511, 1601, 1741, 1811, 1831, 1901, 3011, 3121, 3191, 3203, 3221, 3251, 3271, 3301, 3371, 3391, 3433, 3511, 3541, 3571, 3613, 3643, 3733, 3803, 3821 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

dr[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Select[Prime[Range[1000]], PrimeQ[dr[ # ]]&&dr[ # ]<#&]

CROSSREFS

Cf. A006567 Emirps (primes whose digit reversal is a different prime), A109308 Lesser emirps (primes whose digit reversal is a larger prime).

Sequence in context: A193573 A086042 A086051 * A263242 A127191 A003542

Adjacent sequences:  A109306 A109307 A109308 * A109310 A109311 A109312

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Jun 25 2005

STATUS

approved

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Last modified June 24 09:56 EDT 2017. Contains 288697 sequences.