Voozh

A363659

Numbers k such that the last letter of k is the same as the first letter of k+1 when written in English.

0, 18, 28, 38, 79, 81, 83, 85, 97, 102, 122, 132, 142, 152, 162, 172, 182, 192, 208, 228, 238, 248, 258, 268, 278, 288, 298, 308, 328, 338, 348, 358, 368, 378, 388, 398, 799, 801, 803, 805, 809, 812, 821, 823, 825, 829, 831, 833, 835, 839, 841, 843, 845, 849

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

REFERENCES

GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See Puzzle 31, page 37.

LINKS

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

PROG

(Python)

from num2words import num2words as n2w

def ok(n): return n2w(n)[-1] == n2w(n+1)[0]

print([k for k in range(850) if ok(k)]) # Michael S. Branicky, Jun 14 2023