A086916 Number of digits in terms of A087732.

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

Offset

1,3

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).

Links

Table of n, a(n) for n=1..74.

Example

a(23)=9 since A087732(23)=106696589 has 9 digits.
a(31)=12 since A087732(31)=103515091679 has 12 digits.

Crossrefs

Cf. A086916, A087651, A087730, A087731, A087732, A088676.

Sequence in context: A029917 A062300 A231152 * A008680 A120203 A029280

Adjacent sequences: A086913 A086914 A086915 * A086917 A086918 A086919

Keyword

nonn,base

Author

Pierre CAMI, Sep 25 2003

Extensions

Edited by Ray Chandler, Oct 05 2003

Status

approved