login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A109066 Number of prime digits in n-th prime. 8
1, 1, 1, 1, 0, 1, 1, 0, 2, 1, 1, 2, 0, 1, 1, 2, 1, 0, 1, 1, 2, 1, 1, 0, 1, 0, 1, 1, 0, 1, 2, 1, 2, 1, 0, 1, 2, 1, 1, 2, 1, 0, 0, 1, 1, 0, 1, 3, 3, 2, 3, 2, 1, 2, 3, 2, 1, 2, 3, 1, 2, 2, 2, 1, 2, 2, 2, 3, 2, 1, 3, 2, 2, 3, 2, 2, 1, 2, 0, 0, 0, 1, 1, 2, 1, 1, 0, 2, 0, 1, 1, 1, 1, 0, 0, 2, 1, 2, 3, 1, 2, 3, 2, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

COMMENTS

Cf. A019546 primes whose digits are primes, A092629 number of prime digits is nonprime, A104250 sum of prime digits of n-th prime.

The prime A000040(n) is in A034844 iff a(n) = 0; it is in A179336 iff a(n) > 0. [From Reinhard Zumkeller, Jul 11 2010, corrected by M. F. Hasler, Aug 27 2012]

a(n) = A193238(A000040(n)). [Reinhard Zumkeller, Jul 19 2011]

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

MATHEMATICA

a[n_]:=Count[PrimeQ/@IntegerDigits[Prime[n]], True]

CROSSREFS

Cf. A019546, A092629, A104250.

Sequence in context: A137412 A025925 A240857 * A079066 A157188 A173266

Adjacent sequences:  A109063 A109064 A109065 * A109067 A109068 A109069

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Jun 17 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 24 00:29 EDT 2017. Contains 291052 sequences.