A383290 - OEIS

A383290

Number of happy primes <= 10^n.

1, 7, 35, 200, 1465, 11144, 91323, 812371, 7408754, 67982202, 621496655, 5589870847, 49554946008

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OFFSET

1,2

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

Table of n, a(n) for n=1..13.

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

CROSSREFS

Cf. A007770, A035497, A068571.

Sequence in context: A360083 A267712 A377158 * A263513 A274073 A177261

Adjacent sequences: A383287 A383288 A383289 * A383291 A383292 A383293

KEYWORD

nonn,base,more

AUTHOR

Shyam Sunder Gupta, Apr 22 2025

EXTENSIONS

a(11) from Amiram Eldar, Apr 23 2025

a(12)-a(13) from Rahid Zaman, Feb 09 2026

STATUS

approved