

A091632


Excess of n + product of digits over next prime associated with A091628.


5



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
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OFFSET

1,2


COMMENTS

Sequence arising in Farideh Firoozbakht's solution to Prime Puzzle 251  23 is the only pointer prime (A089823) not containing the digit "1".
The monotonically increasing value of successive excess (and product of digits (A091629)) strongly suggests that in successive n the digit 1 must be present.


LINKS

Table of n, a(n) for n=1..30.
Carlos Rivera's Prime Puzzles and Problems Connection, Puzzle 251, Pointer primes


FORMULA

a(n) = A091630(n)  A091631(n).


EXAMPLE

a(2) = 235  227 = 8.


CROSSREFS

Cf. A089823, A091628, A091629, A091630, A091631.
Sequence in context: A303527 A325999 A240036 * A060768 A218464 A060809
Adjacent sequences: A091629 A091630 A091631 * A091633 A091634 A091635


KEYWORD

base,easy,nonn


AUTHOR

Enoch Haga, Jan 24 2004


EXTENSIONS

Edited and extended by Ray Chandler, Feb 07 2004


STATUS

approved



