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Search: id:A091630
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| 29, 235, 2247, 22271, 222319, 2222415, 22222607, 222222991, 2222223759, 22222225295, 222222228367, 2222222234511, 22222222246799, 222222222271375, 2222222222320527, 22222222222418831, 222222222222615439
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OFFSET
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1,1
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COMMENT
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Sequence arising in Faride Firoozbakht's solution to Prime Puzzle 251 - 23 is only pointer prime (A089823) not containing digit "1".
The monotonic increasing value of successive product of digits (A091629) strongly suggests that in successive n the digit 1 must be present.
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LINKS
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Carlos Rivera's Prime Puzzles and Problems Connection, Puzzle 251, Pointer primes
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FORMULA
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a(n) = A091628(n) + A091629(n).
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EXAMPLE
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a(1) = 23+6 = 29.
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CROSSREFS
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Cf. A089823, A091628, A091629, A091631, A091632.
Sequence in context: A091631 A093401 A042636 this_sequence A027112 A142095 A140845
Adjacent sequences: A091627 A091628 A091629 this_sequence A091631 A091632 A091633
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KEYWORD
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base,easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Jan 24 2004
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EXTENSIONS
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Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Feb 07 2004
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