A115299 Greatest digit of n + least digit of n. Different from A088133.

2, 4, 6, 8, 10, 12, 14, 16, 18, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 8, 9, 10, 11, 12, 13, 14

Offset

1,1

Comments

a(101) = 1 and A088133(101) = 2, but all previous terms match.

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Example

a(1) = 1 + 1 = 2, a(232) = 3 + 2 = 5, a(1889009898) = 9 + 0 = 9.

Mathematica

Array[Max[#] + Min[#] &@ IntegerDigits[#] &, 120] (* Michael De Vlieger, Dec 12 2023 *)

Prog

(Python)
def a(n): d = list(map(int, str(n))); return max(d) + min(d)
print([a(n) for n in range(1, 87)]) # Michael S. Branicky, Dec 12 2023

Crossrefs

Cf. A037904 (greatest-least), A115300 (greatest*least), A088133 (first+last).

Sequence in context: A074157 A076309 A088133 * A076312 A061762 A136614

Adjacent sequences: A115296 A115297 A115298 * A115300 A115301 A115302

Keyword

base,nonn

Author

Rick L. Shepherd, Jan 20 2006

Status

approved