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A110746 Beginning with 1, least multiple of a(n-1) such that backward concatenation of two or more terms is a prime. Sequence read digitwise backward gives primes. a(n) reversed concatenated with a(n-1) reversed,... a(2) reversed, a(1) reversed is prime. +0
2
1, 1, 2, 4, 8, 136, 272 (list; graph; listen)
OFFSET

1,3

EXAMPLE

11,211,4211,84211,63184211 are all primes.

CROSSREFS

Cf. A110747.

Sequence in context: A018777 A130693 A060815 this_sequence A084010 A133036 A083147

Adjacent sequences: A110743 A110744 A110745 this_sequence A110747 A110748 A110749

KEYWORD

base,more,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 10 2005

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.


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