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A078790 Palindromic primes with successive increasing difference: a(k)-a(k-1) > a(k+1)- a(k). 1
2, 5, 11, 101, 313, 727, 10301, 19891, 30103, 70207, 1003001, 1936391, 3001003, 7014107, 100030001, 193191391, 300020003, 700020007, 10000500001, 19301110391, 30000500003, 70005450007, 1000008000001, 1930022200391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

MATHEMATICA

p = 1; d = 0; Do[ q = FromDigits[ Join[ IntegerDigits[n], Drop[ Reverse[ IntegerDigits[n]], 1]]]; If[ PrimeQ[q] && q - p > d, Print[q]; d = q - p; p = q], {n, 2, 3000002}]

CROSSREFS

Cf. A071250.

Sequence in context: A178318 A134996 A134998 * A158999 A069506 A239900

Adjacent sequences:  A078787 A078788 A078789 * A078791 A078792 A078793

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Dec 03 2002

EXTENSIONS

Corrected by T. D. Noe, Oct 25 2006

STATUS

approved

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Last modified August 29 03:31 EDT 2015. Contains 261184 sequences.