A215693 English flagpole sequence (see comments).

1, 7, 3, 6, 5, 11, 8, 9, 2, 13, 4, 10, 12, 16, 15, 26, 14, 18, 17, 19, 20, 111, 21, 25, 22, 23, 24, 28, 38, 30, 27, 29, 31, 37, 33, 32, 42, 34, 35, 36, 39, 40, 41, 43, 45, 47, 44, 46, 54, 48, 49, 51, 57, 50, 52, 53, 112, 55, 58, 56, 59, 60, 61, 63, 65, 67, 64, 62, 74, 66, 68, 69, 70, 71, 72, 73, 75, 76, 77, 78, 79, 86, 84, 81, 94, 83, 80, 82, 85, 87, 88, 89, 98, 93, 90, 91, 92, 95, 96, 97, 105, 99, 100, 102, 101, 103, 104, 106, 108, 107, 109, 110, 113

Offset: 1

Author

Eric Angelini, Hans Havermann, Aug 27 2012

Keywords

• nonn
• word

Comments

a(1) = 1, fp = "one"; a(2) = smallest number not yet used whose English number-word contains letter #2 of fp (= 7, seveN), fp = "oneseven"; a(3) = smallest number not yet used whose English number-word contains letter #3 of fp (= 3, thrEe), fp = "oneseventhree"; etc. Number-word spaces, hyphens, commas, and the conjunctive 'and' are ignored.

Examples

			Term #30419 of our sequence is 30419. The positions of the appended "thirtythousandfourhundrednineteen" in fp are letters #999990 to #1000022. Letters #1000000 - #1000004 of fp are S, A, N, D, F. At 999999, all numbers up to 999999 (and no numbers beyond) have been used. Therefore a(1000000) - a(1000004) are 1000006 (one million Six), 1001000 (one million one thousAnd), 1000000 (oNe million), 1000100 (one million one hunDred), and 1000004 (one million Four).
		

Links

• Eric Angelini, Flagpole
• E. Angelini, Flagpole [Cached copy, with permission]
• Hans Havermann, Flagpole sections (number-word terms up to 1050000)