A119424 Length of primes formed by the initial decimal digits of the base e expansion of Pi.

3, 18, 84, 373, 1410

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

a(1) = 3 because the first 3 digits of the base e expansion of Pi are 10.1 [meaning pi ~ 1*(e^1) + 0*(e^0) + 1*(e^-1)] and 101 (base 10) is prime.
a(2) = 18 because the first 18 digits of the base e expansion of Pi are 1, 0, 1010020200021111 which (base 10) is prime.
a(3) = 84 because there are 84 digits in 101010020200021111200201011200010102020001110120200101200020011011201012100100021001 which is prime.

Crossrefs

Cf. A000040, A005042, A050948.

Sequence in context: A099012 A122069 A103897 * A301996 A218924 A037295

Adjacent sequences: A119421 A119422 A119423 * A119425 A119426 A119427

Keyword

base,nonn

Author

Jonathan Vos Post, Jul 26 2006

Status

approved