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A069851 Number of distinct primes obtained by inserting a 0 at all possible places in n. This includes prefixing. 9
0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

See the example in A069842.

MATHEMATICA

Table[ Count[ PrimeQ[ Union[ FromDigits /@ Table[ Insert[ IntegerDigits[n], 0, j], {j, 1, Floor[ Log[10, n] + 2]}]]], True], {n, 1, 105}]

CROSSREFS

Cf. A069842, A069843, A069844, A069845, A069846, A069847, A069848, A069849 and A069850.

Sequence in context: A262682 A318983 A318982 * A197629 A198255 A290542

Adjacent sequences:  A069848 A069849 A069850 * A069852 A069853 A069854

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Apr 16 2002

EXTENSIONS

Edited and extended by Robert G. Wilson v, Apr 18 2002

STATUS

approved

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Last modified July 24 20:26 EDT 2021. Contains 346273 sequences. (Running on oeis4.)