A057573 Number of primes in A051351 which have index <= 10^n.

1, 7, 25, 122, 934, 7268, 61756, 537324, 4756645

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Index entries for sequences related to numbers of primes in various ranges

Mathematica

NextPrime[ n_Integer ] := Module[ {k}, k = n + 1; While[ ! PrimeQ[ k ], k++ ]; k ]; c = d = p = q = 0; Do[ While[ d++; d <= 10^n, q = NextPrime[ q ]; p = p + Apply[ Plus, RealDigits[ q ] [[ 1 ] ]]; If[ PrimeQ[ p ], c++ ]]; d--; Print[ c ], {n, 0, 10} ]

Crossrefs

Cf. A051351 and A058049.

Sequence in context: A141626 A138292 A138738 * A082651 A241714 A151491

Adjacent sequences: A057570 A057571 A057572 * A057574 A057575 A057576

Keyword

nonn

Author

Robert G. Wilson v, Nov 27 2000

Extensions

Offset corrected by Sean A. Irvine, Jun 17 2022

Status

approved