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

Author

Pierre CAMI, Sep 25 2003

Keywords

• nonn
• base

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).

Examples

			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.

Extensions

Edited by Ray Chandler, Oct 05 2003