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A052091
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Left parts needed for the construction of the palindromic prime pyramid starting with 2.
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4
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2, 7, 3, 33, 9, 30, 18, 92, 3, 133, 18, 117, 17, 15, 346, 93, 33, 180, 120, 194, 126, 336, 331, 330, 95, 12, 118, 369, 39, 32, 165, 313, 165, 134, 13, 149, 195, 145, 158, 720, 18, 396, 193, 102, 737, 964, 722, 156, 106, 395, 945, 303, 310, 113, 150, 303, 715, 123
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Each term is the smallest to have the previous term as a centered substring, beginning with the smallest palindromic prime 2. The right parts are the reversals of the above terms leading zeros included. The terms from a(34) onward are currently only proved for strongpseudoprime.
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LINKS
| P. De Geest, World!Of Palindromic Primes, Page 3
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EXAMPLE
| Start with 2; add 7 gives 727; add 3 gives 37273; add 33 gives 333727333; etc.
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CROSSREFS
| Cf. A053600, A052092, A047076.
Sequence in context: A112303 A089124 A117809 * A090276 A090564 A079072
Adjacent sequences: A052088 A052089 A052090 * A052092 A052093 A052094
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Jan 15 2000.
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EXTENSIONS
| Comments from G. L. Honaker, Jr. (honak3r(AT)gmail.com), Mar 30 2000.
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