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Search: id:A091632
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| A091632 |
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Excess of n + product of digits over next prime associated with A091628. |
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+0
6
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| 0, 8, 10, 42, 72, 176, 354, 764, 1516, 3022, 6066, 12268, 24570, 49148, 98246, 196530, 393158, 786406, 1572834, 3145674, 6291440, 12582874, 25165764, 50331634, 100663192, 201326576, 402653180, 805306350, 1610612690, 3221225038
(list; graph; listen)
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OFFSET
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1,2
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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 excess [and 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) = A091630(n) - A091631(n).
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EXAMPLE
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a(2)=235-227=8.
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CROSSREFS
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Cf. A089823, A091628, A091629, A091630, A091631.
Sequence in context: A108940 A007939 A126807 this_sequence A060768 A060809 A112547
Adjacent sequences: A091629 A091630 A091631 this_sequence A091633 A091634 A091635
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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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