login
A161871
Smallest happy number > 1 in base n.
2
2, 3, 2, 5, 6, 7, 8, 3, 7, 11, 12, 13, 14, 15, 2, 17, 2, 5, 2, 21, 22, 23, 24, 5, 26, 27, 28, 3, 2, 31, 32, 33, 3, 35, 6, 31, 38, 39, 40, 13, 42, 43, 44, 45, 46, 47, 48, 7, 50, 51, 52, 31, 54, 53, 56, 57, 58, 59, 54, 61, 62, 63, 8, 65, 66, 67, 12, 69, 70, 71, 72
OFFSET
2,1
LINKS
MATHEMATICA
happyQ[n_, b_] := NestWhile[Plus @@ (IntegerDigits[#, b]^2) &, n, UnsameQ, All] == 1; a[b_] := Module[{k=2}, While[!happyQ[k, b], k++]; k]; Array[a, 100, 2] (* Amiram Eldar, May 28 2020 *)
CROSSREFS
Cf. A007770 (happy numbers in base 10).
Sequence in context: A293303 A333569 A110500 * A331737 A135875 A372379
KEYWORD
nonn,base
AUTHOR
Jud McCranie, Jun 20 2009
STATUS
approved