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Search: id:A077391
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| A077391 |
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Smallest n-digit prime which leaves a prime at every step if most significant digit and least significant digit are deleted until a one digit or two digit prime is obtained, or 0 if no such prime exists. |
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+0
1
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OFFSET
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1,1
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COMMENT
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Conjecture: No term is zero.
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EXAMPLE
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a(6) = 100237: this is the smallest 6-digit number such that deleting MSD and LSD yields prime at every step, i.e. 100237, 0023, 02 all are primes.
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CROSSREFS
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Cf. A077390.
Sequence in context: A155928 A001946 A112864 this_sequence A104087 A154596 A066382
Adjacent sequences: A077388 A077389 A077390 this_sequence A077392 A077393 A077394
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 07 2002
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