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A229782
Common difference in sets of 4 consecutive palindromic primes (palprimes) in arithmetic progression.
0
3000, 30000, 81000, 30000, 81000, 810000, 810000, 1110000, 1110000, 810000, 300000, 300000, 810000, 1920000, 810000, 300000, 300000, 300000, 300000, 300000, 1110000, 8100000, 8100000, 11100000, 8100000, 8100000, 3000000, 11100000, 8100000, 8100000, 8100000
OFFSET
1,1
EXAMPLE
a(2)=30000 since (159202951, 159232951, 159262951, 159292951) is the second arithmetic progression of 4 consecutive palindromic primes with common difference = 30000.
CROSSREFS
Cf. A059121.
Sequence in context: A329169 A236982 A202097 * A269885 A269764 A156655
KEYWORD
nonn,base
AUTHOR
Shyam Sunder Gupta, Sep 29 2013
STATUS
approved