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A069090
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Primes none of whose proper initial segments are primes.
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2
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2, 3, 5, 7, 11, 13, 17, 19, 41, 43, 47, 61, 67, 83, 89, 97, 101, 103, 107, 109, 127, 149, 151, 157, 163, 167, 181, 401, 409, 421, 443, 449, 457, 461, 463, 467, 487, 491, 499, 601, 607, 631, 641, 643, 647, 653, 659, 661, 683, 691, 809, 811, 821, 823, 827, 829
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Franklin T. Adams-Watters, Table of n, a(n) for n=0..1000
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EXAMPLE
| The proper initial segments of 499 are 4 and 49, none of which are primes. So 499 is a term of the sequence.
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PROG
| (PARI) ina(n)=if(!isprime(n), return(0)); while(n>9, n\=10; if(isprime(n), return(0))); 1 [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 26 2009]
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CROSSREFS
| Cf. A074721. [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 26 2009]
Sequence in context: A181561 A069709 A144755 * A088415 A175063 A198196
Adjacent sequences: A069087 A069088 A069089 * A069091 A069092 A069093
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KEYWORD
| base,nonn
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AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Apr 05 2002
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EXTENSIONS
| More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 26 2009
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