A383290 Number of happy primes <= 10^n.

1, 7, 35, 200, 1465, 11144, 91323, 812371, 7408754, 67982202, 621496655

Offset: 1

Author

Shyam Sunder Gupta, Apr 22 2025

Keywords

• nonn
• base
• more

Comments

The proportion of happy primes to total primes seems to follow the same pattern as the proportion of happy numbers to total numbers, at least up to 10^10.

Links

• Shyam Sunder Gupta, Happy Numbers, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 7, 209-222.

Crossrefs

Cf. A007770, A035497, A068571.

Extensions

a(11) from Amiram Eldar, Apr 23 2025