Question 24692: The Full Recurrence Keeps Both Initial Boundary Terms in Its OGF

Original question and givens

Use the whole recurrence a_n=a_(n−1)+a_(n−2) for every n≥2, initial a_0=17, a_1=18, and x=1/5 with |x|<1/2. Give (a0, a1, coefficient_preview, x, numerator, denominator, analytic_value, certificate).

• G001 — Use the whole recurrence a_n=a_(n−1)+a_(n−2) for every n≥2, initial a_0=17, a_1=18, and x=1/5 with |x|<1/2. Give (a0, a1, coefficient_preview, x, numerator, denominator, analytic_value, certificate).

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

• mko-analytic-ordinary-generating-function

Step-by-step derivation

source roles = [ogf-recurrence-boundary-terms]

derived = [[a0, a1, coefficient_preview, x, numerator, denominator, analytic_value, certificate]]

OGF complete recurrence coefficient2 := sum(17, 18)

OGF complete recurrence coefficient2 = 35

OGF complete recurrence coefficient3 := sum(18, 35)

OGF complete recurrence coefficient3 = 53

OGF complete recurrence coefficient4 := sum(35, 53)

OGF complete recurrence coefficient4 = 88

OGF complete recurrence coefficient5 := sum(53, 88)

OGF complete recurrence coefficient5 = 141

OGF complete recurrence coefficient6 := sum(88, 141)

OGF complete recurrence coefficient6 = 229

OGF complete recurrence coefficient7 := sum(141, 229)

OGF complete recurrence coefficient7 = 370

OGF complete recurrence coefficient8 := sum(229, 370)

OGF complete recurrence coefficient8 = 599

OGF complete recurrence coefficient9 := sum(370, 599)

OGF complete recurrence coefficient9 = 969

OGF initial a1 minus a0 boundary := sub(18, 17)

OGF initial a1 minus a0 boundary = 1

OGF initial boundary times x := mul(1, 1/5)

OGF initial boundary times x = 1/5

OGF numerator with BOTH initial terms := sum(17, 1/5)

OGF numerator with BOTH initial terms = 86/5

(1/5)^2

OGF original x square = 1/25

OGF denominator one minus x := sub(1, 1/5)

OGF denominator one minus x = 4/5

OGF denominator subtract x squared := sub(4/5, 1/25)

OGF denominator subtract x squared = 19/25

OGF recurrence analytic closed value := div(86/5, 19/25)

OGF recurrence analytic closed value = 430/19

source roles = [17, 18, 1/5, [17, 18, 35, 53, 88, 141, 229, 370, 599, 969]]

derived = [86/5, 19/25, 430/19, (1-x-x^2)A=a0+(a1-a0)x]

Reverse checks

• S017 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S016 · premise_and_result_audit — Recompute OGF recurrence analytic closed value with exact rational arithmetic, not rounded decimals.
• S015 · premise_and_result_audit — Recompute OGF denominator subtract x squared with exact rational arithmetic, not rounded decimals.
• S014 · premise_and_result_audit — Recompute OGF denominator one minus x with exact rational arithmetic, not rounded decimals.
• S013 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S012 · premise_and_result_audit — Recompute OGF numerator with BOTH initial terms with exact rational arithmetic, not rounded decimals.
• S011 · premise_and_result_audit — Recompute OGF initial boundary times x with exact rational arithmetic, not rounded decimals.
• S010 · premise_and_result_audit — Recompute OGF initial a1 minus a0 boundary with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Recompute OGF complete recurrence coefficient9 with exact rational arithmetic, not rounded decimals.
• S008 · premise_and_result_audit — Recompute OGF complete recurrence coefficient8 with exact rational arithmetic, not rounded decimals.
• S007 · premise_and_result_audit — Recompute OGF complete recurrence coefficient7 with exact rational arithmetic, not rounded decimals.
• S006 · premise_and_result_audit — Recompute OGF complete recurrence coefficient6 with exact rational arithmetic, not rounded decimals.
• S005 · premise_and_result_audit — Recompute OGF complete recurrence coefficient5 with exact rational arithmetic, not rounded decimals.
• S004 · premise_and_result_audit — Recompute OGF complete recurrence coefficient4 with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute OGF complete recurrence coefficient3 with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Recompute OGF complete recurrence coefficient2 with exact rational arithmetic, not rounded decimals.
• S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

(17, 18, [17, 18, 35, 53, 88, 141, 229, 370, 599, 969], 1/5, 86/5, 19/25, 430/19, A(x)=(a0+(a1-a0)x)/(1-x-x^2)_with_initial_boundary_terms_preserved)

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.