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 A069791 Primes which yield primes each time the process of removing two outermost digits is carried out until finally a two digit prime (possibly with a leading 0) is obtained. 0
 1021, 1031, 1033, 1039, 1051, 1117, 1171, 1193, 1231, 1237, 1291, 1297, 1319, 1373, 1433, 1439, 1471, 1531, 1597, 1613, 1619, 1733, 1831, 1973, 1979, 2027, 2029, 2039, 2053, 2111, 2113, 2131, 2137, 2179, 2237, 2239, 2293, 2297, 2311, 2371 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..40. EXAMPLE 101737 is a member as the number obtained by removing the first and the last digit 0173 is a prime and further removing the first and the last digit gives another prime 17. MATHEMATICA Select[Prime[Range[PrimePi[1000]+1, PrimePi[9999]]], PrimeQ[FromDigits[Rest[Most[IntegerDigits[#]]]]]&] (* Harvey P. Dale, Jan 04 2011 *) CROSSREFS Cf. A069686. Sequence in context: A102925 A216115 A024020 * A167846 A303918 A228625 Adjacent sequences: A069788 A069789 A069790 * A069792 A069793 A069794 KEYWORD base,nonn AUTHOR Amarnath Murthy, Apr 09 2002 EXTENSIONS Corrected by T. D. Noe, Nov 01 2006 Corrected and extended by Harvey P. Dale, Jan 04 2011 STATUS approved

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Last modified February 21 22:50 EST 2024. Contains 370239 sequences. (Running on oeis4.)