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 A057573 Number of primes in A051351 which have index <= 10^n. 1
 1, 7, 25, 122, 934, 7268, 61756, 537324, 4756645 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified December 2 08:12 EST 2023. Contains 367515 sequences. (Running on oeis4.)