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 A231623 Smallest starting deficient number for n consecutive deficient numbers in arithmetic progression. 6
 1, 1, 1, 2987, 801339, 221355125, 221355125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,4 COMMENTS The next term is a(10) > 10^9. The common difference for first 3 terms is 1 and for next 4 terms is 2. LINKS EXAMPLE First and smallest occurrence of n, n >= 3, consecutive deficient numbers in arithmetic progression: a(3) = 1: (1, 2, 3); a(4) = 1: (1, 2, 3, 4); a(5) = 1: (1, 2, 3, 4, 5); a(6) = 2987: (2987, 2989, 2991, 2993, 2995, 2997); a(7) = 801339: (801339, 801341, 801343, 801345, 801347, 801349, 801351); a(8) = 221355125: (221355125, 221355127, 221355129, 221355131, 221355133, 221355135, 221355137, 221355139); a(9) = 221355125: (221355125, 221355127, 221355129, 221355131, 221355133, 221355135, 221355137, 221355139, 221355141); CROSSREFS Cf. A005100, A228433. Sequence in context: A186866 A252571 A231628 * A108926 A159731 A221725 Adjacent sequences:  A231620 A231621 A231622 * A231624 A231625 A231626 KEYWORD nonn,hard,more AUTHOR Shyam Sunder Gupta, Nov 11 2013 STATUS approved

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Last modified January 18 21:06 EST 2021. Contains 340262 sequences. (Running on oeis4.)