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 A091630 Numbers n + product of digits associated with A091628. 5
 29, 235, 2247, 22271, 222319, 2222415, 22222607, 222222991, 2222223759, 22222225295, 222222228367, 2222222234511, 22222222246799, 222222222271375, 2222222222320527, 22222222222418831, 222222222222615439 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 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 product of digits (A091629) strongly suggests that in successive n the digit 1 must be present. LINKS Carlos Rivera's Prime Puzzles and Problems Connection, Puzzle 251, Pointer primes FORMULA a(n) = A091628(n) + A091629(n). EXAMPLE a(1) = 23 + 6 = 29. CROSSREFS Cf. A089823, A091628, A091629, A091631, A091632. Sequence in context: A093401 A228408 A042636 * A251424 A027112 A142095 Adjacent sequences:  A091627 A091628 A091629 * A091631 A091632 A091633 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 22 05:47 EDT 2019. Contains 327287 sequences. (Running on oeis4.)