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A086916
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Number of digits in terms of A087732.
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5
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1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 9, 9, 10, 10, 10, 10, 10, 10, 12, 13, 14, 15, 18, 20, 21, 23, 23, 23, 25, 28, 28, 29, 29, 32, 33, 35, 37, 38, 39, 41, 43, 45, 47, 50, 55, 57, 62, 62, 66, 73, 79, 92, 101, 106, 108, 115, 121, 123, 126, 131, 140, 141
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Number of digits of the twin primes of the form j*P(i)# - 1 and j*P(i)# + 1 with 0 < j < P(i+1), P(i)= i rank primes, P(i)# = primorial of P(i) (A002110).
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EXAMPLE
| a(23)=9 since A087732(23)=106696589 has 9 digits.
a(31)=12 since A087732(31)=103515091679 has 12 digits.
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CROSSREFS
| Cf. A086916, A087651, A087730, A087731, A087732, A088676.
Sequence in context: A057810 A029917 A062300 * A008680 A120203 A029280
Adjacent sequences: A086913 A086914 A086915 * A086917 A086918 A086919
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KEYWORD
| nonn,base
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AUTHOR
| Pierre CAMI (colettecami(AT)aol.com), Sep 25 2003
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EXTENSIONS
| Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 05 2003
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