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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 18 20:22 EDT 2019. Contains 327181 sequences. (Running on oeis4.)