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A077390 Primes which leave primes at every step if most significant digit and least significant digit are deleted until a one digit or two digit prime is obtained. +0
2
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 127, 131, 137, 139, 151, 157, 173, 179, 223, 229, 233, 239, 331, 337, 421, 431, 433 (list; graph; listen)
OFFSET

1,1
COMMENT

Is the sequence finite?

EXAMPLE

21313 is a member as 21313, 131 and 3 all are primes.

CROSSREFS

Adjacent sequences: A077387 A077388 A077389 this_sequence A077391 A077392 A077393

Sequence in context: A030475 A069676 A062353 this_sequence A069677 A069678 A069679

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 07 2002

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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